0000950170-23-002364 | 10-Q | XBRL Viewer

Balance Sheet Information (Tables)

3 Months Ended

Dec. 31, 2022

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Summary of Certain Significant Amounts Included in Condensed Consolidated Balance Sheet

Certain significant amounts included in the condensed consolidated balance sheets consisted of the following (in thousands):


	December 31,			September 30,
	2022			2022
Expendable parts and supplies, net:
Expendable parts and supplies	$	32,013		$	31,913
Less: obsolescence and other		(6,504	)		(5,198	)
	$	25,509		$	26,715
Prepaid expenses and other current assets:
Prepaid aviation insurance	$	1,026		$	2,618
Prepaid vendors		906			1,310
Prepaid other insurance		798			1,268
Lease incentives		143			352
Prepaid fuel and other		1,080			1,068
	$	3,953		$	6,616
Property and equipment, net:
Aircraft and other flight equipment	$	1,354,137		$	1,260,143
Other equipment		5,709			5,577
Leasehold improvements		2,776			2,776
Vehicles		1,003			992
Building		777			777
Furniture and fixtures		298			298
Total property and equipment		1,364,700			1,270,563
Less: accumulated depreciation		(419,155	)		(405,309	)
	$	945,545		$	865,254
Other assets:
Investments in equity securities	$	13,408		$	15,178
Lease incentives		1,061			1,097
Other		515			15
	$	14,984		$	16,290
Other accrued expenses:
Accrued property taxes	$	6,066		$	5,866
Accrued interest		5,016			2,882
Accrued vacation		7,768			4,746
Accrued lodging		3,529			3,795
Accrued maintenance		2,154			1,453
Accrued liability on government payroll program		—			2,967
Accrued simulator costs		149			1,045
Accrued employee benefits		1,097			1,679
Accrued fleet operating expense		1,232			1,606
Other		3,550			2,961
	$	30,561		$	29,000
Other noncurrent liabilities:
Warrant liabilities	$	25,225		$	25,225
Lease incentive obligations		1,050			1,050
Long-term employee benefits		843			1,123
Other		1,820			1,821
	$	28,938		$	29,219

Fair Value Measurements (Tables)

3 Months Ended

Dec. 31, 2022

Fair Value Disclosures [Abstract]

Carrying Value and Estimated Fair Value of Long-term Debt, Including Current Matur

The carrying value and estimated fair value of our total long-term debt, including current maturities, were as follows (in millions):



	December 31, 2022				September 30, 2022
	Carrying		Fair		Carrying		Fair
	Value		Value		Value		Value
Long-term debt and finance leases, including current maturities(1)	$	701.3	$	635.6	$	615.3	$	541.7

(1) Current and prior period long-term debts' carrying and fair values exclude net debt issuance costs.

Fair Value Measurements

3 Months Ended

Dec. 31, 2022

Fair Value Disclosures [Abstract]

Fair Value Measurements

Fair value is an exit price representing the amount that would be received to sell an asset, or paid to transfer a liability, in an orderly transaction between market participants. As such, fair value is a market-based measurement that should be determined based on assumptions that market participants would use in pricing an asset or liability. Accounting standards include disclosure requirements relating to the fair values used for certain financial instruments and establish a fair value hierarchy. The hierarchy prioritizes valuation inputs into three levels based on the extent to which inputs used in measuring fair value are observable in the market. Each fair value measurement is reported in one of three levels:


Level 1	—	Observable inputs such as quoted prices in active markets for identical assets or liabilities;
Level 2	—	Inputs, other than quoted prices in active markets, which are observable either directly or indirectly; and
Level 3	—	Unobservable inputs in which there is little or no market data, requiring an entity to develop its own assumptions.

Other than our assets held for sale and investments in equity securities described in Notes 6 and 7, respectively, we did not measure any of our assets or liabilities at fair value on a recurring or nonrecurring basis as of December 31, 2022 and September 30, 2022.

The carrying values reported in the condensed consolidated balance sheets for cash and cash equivalents, accounts receivable, and accounts payable approximate fair value because of the immediate or short-term maturity of these financial instruments.

Our debt agreements are not traded on an active market. We have determined the estimated fair value of our debt to be Level 3, as certain inputs used to determine the fair value of these agreements are unobservable and, therefore, could be sensitive to changes in inputs. We utilize the discounted cash flow method to estimate the fair value of Level 3 debt.

The carrying value and estimated fair value of our total long-term debt, including current maturities, were as follows (in millions):



	December 31, 2022				September 30, 2022
	Carrying		Fair		Carrying		Fair
	Value		Value		Value		Value
Long-term debt and finance leases, including current maturities(1)	$	701.3	$	635.6	$	615.3	$	541.7

(1) Current and prior period long-term debts' carrying and fair values exclude net debt issuance costs.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Earnings Per Share - Number of Weighted-Average Potentially Dilutive Shares Excluded from Calculation of Diluted Net Loss Per Share (Detail)	3 Months Ended
	Dec. 31, 2021 shares
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from calculation of diluted net income (loss) per share	2,556
Number of Warrants [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from calculation of diluted net income (loss) per share	2,215
Restricted Stock [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from calculation of diluted net income (loss) per share	341

Assets Held for Sale	3 Months Ended
Dec. 31, 2022
Discontinued Operations And Disposal Groups [Abstract]
Assets Held for Sale	6. Assets Held for Sale During 2022, our management committed to a formal plan to sell certain of our CRJ-900, CRJ-200, and CRJ-700 aircraft. Accordingly, we determined the aircraft met the criteria to be classified as assets held for sale and have separately presented them in our condensed consolidated balance sheet at the lower of their current carrying value or their fair market value less costs to sell. The fair values are based upon observable and unobservable inputs, including recent purchase offers and market trends and conditions. The assumptions used to determine the fair value of our assets held for sale are subject to inherent uncertainty and could produce a wide range of outcomes which we will continue to monitor in future periods as new information becomes available. Prior to the ultimate sale of the assets, subsequent changes in our estimate of the fair value of our assets held for sale will be recorded as a gain or loss with a corresponding adjustment to the assets’ carrying value. As of December 31, 2022, the Company has 11 CRJ-900 aircraft, eight (8) CRJ-700 aircraft, and one (1) CRJ-200 aircraft that are classified as assets held for sale with a net book value of $73.0 million, which is reflected within assets held for sale on our condensed consolidated balance sheet. The Company closed the sale of its eight (8) CRJ-700 aircraft in January 2023. The approximate net proceeds from the sale after retirement of debt is $8.0 million. The Company expects to close its sale of the 11 CRJ-900 and one (1) CRJ-200 during the three months ended March 31, 2023.

Assets Held for Sale

3 Months Ended

Dec. 31, 2022

Discontinued Operations And Disposal Groups [Abstract]

Assets Held for Sale

During 2022, our management committed to a formal plan to sell certain of our CRJ-900, CRJ-200, and CRJ-700 aircraft. Accordingly, we determined the aircraft met the criteria to be classified as assets held for sale and have separately presented them in our condensed consolidated balance sheet at the lower of their current carrying value or their fair market value less costs to sell. The fair values are based upon observable and unobservable inputs, including recent purchase offers and market trends and conditions. The assumptions used to determine the fair value of our assets held for sale are subject to inherent uncertainty and could produce a wide range of outcomes which we will continue to monitor in future periods as new information becomes available. Prior to the ultimate sale of the assets, subsequent changes in our estimate of the fair value of our assets held for sale will be recorded as a gain or loss with a corresponding adjustment to the assets’ carrying value.

As of December 31, 2022, the Company has 11 CRJ-900 aircraft, eight (8) CRJ-700 aircraft, and one (1) CRJ-200 aircraft that are classified as assets held for sale with a net book value of $73.0 million, which is reflected within assets held for sale on our condensed consolidated balance sheet.

The Company closed the sale of its eight (8) CRJ-700 aircraft in January 2023. The approximate net proceeds from the sale after retirement of debt is $8.0 million. The Company expects to close its sale of the 11 CRJ-900 and one (1) CRJ-200 during the three months ended March 31, 2023.

Long-Term Debt, Finance Leases, and Other Borrowings

3 Months Ended

Dec. 31, 2022

Debt Disclosure [Abstract]

Long-Term Debt, Finance Leases and Other Borrowings

Long-Term Debt, Finance Leases, and Other Borrowings

Long-term debt as of December 31, 2022 and September 30, 2022, consisted of the following (in thousands):


	December 31,			September 30,
	2022			2022

Senior and subordinated notes payable to secured parties, due in monthly installments, interest based on LIBOR plus interest spread at 2.71% through 2027, collateralized by the underlying aircraft	$	69,919		$	73,850
Notes payable to secured parties, due in semi-annual installments, interest based on LIBOR plus interest spread at 4.75% to 6.25% through 2028, collateralized by the underlying aircraft		131,010			131,010
Notes payable to secured parties, due in quarterly installments, interest based on LIBOR plus interest at spread 2.20% to 2.32% for senior note & 4.50% for subordinated note through 2028, collateralized by the underlying aircraft		102,802			106,865
Other obligations due to financial institution, monthly and/or quarterly interest due from 2022 through 2031, collateralized by the underlying equipment		80,117			18,038
Notes payable to financial institution, due in monthly installments, interest based on LIBOR plus interest spread at 3.10% through 2024, collateralized by the underlying equipment		21,891			26,758
Notes payable to financial institution, due in monthly installments, plus interest spread at 5.00% through 2023, secured by flight equipment		1,500			2,000
Revolving credit facility, monthly interest based on LIBOR plus interest spread at 3.50% through 2022, collateralized by the underlying equipment and investments		41,130			15,630
Notes payable to financial institution, quarterly interest based on LIBOR plus interest spread at 3.50% through 2027		204,947			204,947
Notes payable to financial institution, due in monthly installments, interest based on LIBOR plus interest spread at 4.24%, through 2027, collateralized by the underlying equipment		48,031			36,212
Gross long-term debt, including current maturities		701,347			615,310
Less unamortized debt issuance costs		(8,051	)		(8,303	)
Less notes payable warrants		(6,678	)		(7,272	)
Net long-term debt, including current maturities		686,618			599,735
Less current portion, net of unamortized debt issuance costs		(88,802	)		(97,218	)
Net long-term debt	$	597,816		$	502,517

Principal maturities of long-term debt as of December 31, 2022, and for each of the next five years are as follows (in thousands):


Periods Ending December 31,	Total Principal
2023 (remainder of)	$	73,863
2024		136,272
2025		64,952
2026		274,107
2027		81,106
Thereafter		71,047
	$	701,347

The carrying value of collateralized aircraft and equipment as of December 31, 2022 was approximately $869.2 million.

Enhanced Equipment Trust Certificate ("EETC")

In December 2015, an Enhanced Equipment Trust Certificate ("EETC") pass-through trust was created to issue pass-through certificates to obtain financing for new E-175 aircraft. As of December 31, 2022, we had $131.0 million of equipment notes outstanding issued under the EETC financing included in long-term debt in the condensed consolidated balance sheets. The structure of the EETC financing consists of a pass-through trust created by Mesa to issue pass-through certificates, which represent fractional undivided interests in the pass-through trust and are not obligations of Mesa.

The proceeds of the issuance of the pass-through certificates were used to purchase equipment notes which were issued by Mesa and secured by its aircraft. The payment obligations under the equipment notes are those of Mesa. Proceeds received from the sale of pass-through certificates were initially held by a depositary in escrow for the benefit of the certificate holders until Mesa issued equipment notes to the trust, which purchased such notes with a portion of the escrowed funds.

We evaluated whether the pass-through trust formed for the EETC financing is a Variable Interest Entity ("VIE") and required to be consolidated. We have determined we do not have a variable interest in the pass-through trust, and therefore, we have not consolidated the pass-through trust with our financial statements.

United Revolving Credit Facility

On June 30, 2022, we entered into a Second Amended and Restated Credit and Guaranty Agreement (the "Existing Facility") by and among Mesa Airlines and Mesa Air Group Airline Inventory Management, L.L.C., as borrowers, Mesa Air Group, as a Guarantor, the other guarantors party thereto from time to time, CIT Bank, a division of First-Citizens Bank & Trust Company ("CIT Bank”), as Administrative Agent, First-Citizens Bank & Trust Company (“First Citizens”), as a lender, and the other lenders from time to time party thereto, which was effective as of June 30, 2022 and extended the maturity date of the facility provided by such lenders to such borrowers pursuant to an Amended and Restated Credit and Guaranty Agreement, dated as of September 25, 2019 (as amended) by three (3) months to December 31, 2022.

On December 27, 2022, in connection with entering into the Amended and Restated United CPA, (i) United agreed to purchase and assume all of First Citizens’ rights and obligations as a lender under the Existing Facility pursuant to an Assignment and Assumption Agreement, (ii) United and CIT Bank agreed to amend the Existing Facility pursuant to an Amendment No. 1, dated December 27, 2022 (“Amendment No. 1”), and an Amendment No. 2, dated January 27, 2023 (“Amendment No. 2”; the Existing Facility as amended by Amendment No. 1 and Amendment No. 2, the "Amended Facility"), and (iii) Wilmington Trust, National Association agreed to assume all of CIT Bank’s rights and obligations as Administrative Agent pursuant to an Agency Resignation, Appointment and Assumption Agreement, dated as of January 27, 2023. Amendment No. 1, among other things, extends the Maturity Date from the earlier to occur of November 30, 2028, or the date of the termination of the Amended and Restated United CPA; provides for a revolving loan of $10.0 million plus fees and expenses, which is due January 31, 2024, subject to certain mandatory prepayment requirements; provides for Revolving Commitments equal to $30.7 million plus the original principal amount of the $10 million revolving loan; amortization of the obligations outstanding under the existing CIT Agreement commencing quarterly until March 31, 2025; and a covenant capping Restricted Payments (as defined in the Amended Facility) at $5.0 million per fiscal year, a consolidated interest and rental coverage ratio of 1.00 to 1.00 covenant, and a Liquidity (as defined in the Amended Facility) requirement of not less than $15.0 million at the close of any business day. Interest assessed under the Amended Facility is 3.50% for Base Rate Loans and 4.50% for Term SOFR Loans (as such terms are defined in the Amended Facility). Amendment No. 2, among other things, amends the definition of Controlled Account (as defined in the Amended Facility). Amounts borrowed under this Amended Facility are secured by a collateral pool consisting of a combination of expendable parts, rotable parts and engines and a pledge of the Company’s stock in certain aviation companies. United funded $25.5 million as of the closing date of Amendment No. 1, to be used for general corporate purposes.

Loan Agreement with the United States Department of the Treasury

On October 30, 2020, we entered into a loan and guarantee agreement with the U.S. Department of the Treasury (the “U.S. Treasury”) for a secured loan facility of up to $200.0 million that matures in October 2025 (“the Treasury Loan”). During the first quarter of fiscal 2021, we borrowed an aggregate of $195.0 million. No further borrowings are available under the Treasury Loan.

The Treasury Loan bears interest at a variable rate equal to (a)(i) the LIBOR rate divided by (ii) one minus the Eurodollar Reserve Percentage plus (b) 3.50%. Accrued interest on the loans is payable in arrears, or paid-in-kind by increasing the principal balance of the loan by such interest payment, on the first business day following the 14th day of each March, June, September, and December.

All principal amounts outstanding under the Treasury Loan are due and payable in a single installment on October 30, 2025. Commencing in June 2022, we initiated the payment of interest in lieu of increasing the principal amount of the loan. Our obligations under the Treasury Loan are secured by certain aircraft, aircraft engines, accounts receivable, ground service equipment, flight simulators, and tooling (collectively, the “Collateral”). The obligations under the Treasury Loan are guaranteed by the Company and Mesa Air Group Inventory Management. The proceeds were used for general corporate purposes and operating expenses, to the extent permitted by the Coronavirus Aid, Relief, and Economic Security Act (the “CARES Act”). Voluntary prepayments of the Treasury Loan may be made, in whole or in part, without premium or penalty, at any time and from time to time. Amounts prepaid may not be reborrowed. Mandatory prepayments of the Treasury Loan are required, without premium or penalty, to the extent necessary to comply with the covenants discussed below, certain dispositions of the Collateral, certain debt issuances secured by liens on the Collateral, and certain insurance payments related to the Collateral. In addition, if a “change of control” (as defined in the Treasury Loan) occurs with respect to Mesa Airlines, we will be required to repay the loans outstanding under the Treasury Loan.

The Treasury Loan requires us, under certain circumstances, including within ten (10) business days prior to the last business day of March and September of each year beginning March 2021, to appraise the value of the Collateral and recalculate the collateral coverage ratio. If the calculated collateral coverage ratio is less than 1.6 to 1.0, we are required either to provide additional Collateral (which may include cash collateral) to secure the obligations under the Treasury Loan or repay the term loans under the Treasury Loan, in such amounts that the recalculated collateral coverage ratio, after giving effect to any such additional Collateral or repayment, is at least 1.6 to 1.0.

The Treasury Loan contains two financial covenants, a minimum collateral coverage ratio and a minimum liquidity level. The Treasury Loan also contains customary negative and affirmative covenants for credit facilities of this type, including, among others: (a) limitations on dividends and distributions; (b) limitations on the creation of certain liens; (c) restrictions on certain dispositions, investments, and acquisitions; (d) limitations on transactions with affiliates; (e) restrictions on fundamental changes to the business, and (f) restrictions on lobbying activities. Additionally, we are required to comply with the relevant provisions of the CARES Act, including limits on employment level reductions after September 30, 2020, restrictions on dividends and stock buybacks, limitations on executive compensation, and requirements to maintain certain levels of scheduled service.

In connection with the Treasury Loan and as partial compensation to the U.S. Treasury for the provision of financial assistance under the Treasury Loan, we issued to the U.S. Treasury warrants to purchase an aggregate of 4,899,497 shares of our common stock at an exercise price of $3.98 per share, which was the closing price of the common stock on April 9, 2020. The exercise price and number of shares of common stock issuable under the warrants are subject to adjustment as a result of anti-dilution provisions contained in the warrants for certain stock issuances, dividends, and other corporate actions. The warrants expire on the fifth anniversary of the date of issuance and are exercisable either through net share settlement or net cash settlement, at our option. The fair value of the warrants was estimated using a Black-Scholes option pricing model and recorded in stockholders' equity with an offsetting debt discount to the Treasury Loan in the condensed consolidated balance sheets.

In December 2022, we entered into an agreement with the U.S. Treasury to lower the minimum collateral coverage ratio ("CCR") covenant to 1.55 to 1.0 effective through the maturity date of the Treasury Loan and waive the CCR covenant requirement with respect to the release of liens on Collateral. As a result of the lower CCR covenant, we are in compliance with this covenant as of December 31, 2022.

Spare Engine Financing

In December 2021, we entered into a loan agreement with a financing institution to finance certain purchases of spare engines via a newly formed limited liability company (“LLC”). The loan agreement provides for aggregate borrowings of up to $54.0 million through November 2022. In December 2021, we borrowed an aggregate of $35.3 million under the loan agreement, which matures in December 2027. The borrowed amounts are collateralized by the underlying engines and require monthly principal and interest payments until maturity. Borrowings under the loan agreement bear interest at the monthly LIBOR plus 4.24%. The borrowings are the obligation of the newly formed LLC and are guaranteed by Mesa Airlines, Inc..

The newly formed LLC, which is wholly owned by Mesa, was determined to be a VIE for which we are the primary beneficiary because we have the power to direct the activities of the LLC that most significantly impact the LLC’s economic performance and the obligation to absorb losses and right to receive benefits from the LLC in our capacity as sole member of the LLC and guarantor of the borrowings. Therefore, the LLC is consolidated in our financial statements and the borrowings are reflected as long-term debt in our condensed consolidated balance sheets.

The loan agreement contains a loan-to-value (“LTV”) financial covenant pursuant to which we are required to prepay certain amounts of the loan if the aggregate outstanding principal balance of the loan exceeds a specified percentage of the appraised value of the engines beginning in the 12th full month after closing and each June 1 and December 1 thereafter.

As of December 31, 2022, we were in compliance with all debt covenants.

- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-URI https://asc.fasb.org/topic&trid=2208564

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1B
-Subparagraph (h)
-URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1C
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495334-112611

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1I
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495371-112611

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1I
-Subparagraph (d)
-URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495371-112611

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(c))
-URI https://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1B
-Subparagraph (g)
-URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1C
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495334-112611

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1C
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495334-112611

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1E
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495348-112611

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1B
-URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1I
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495371-112611

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1B
-Subparagraph (i)
-URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611

+ Details

Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2022	Sep. 30, 2022
Statement Of Financial Position [Abstract]
Common stock, no par value	$ 0	$ 0
Common stock, shares authorized	125,000,000	125,000,000
Common stock, shares issued	36,378,550	36,376,897
Common stock, shares outstanding	36,378,550	36,376,897
Common stock, warrants issued	4,899,497	4,899,497
Common stock, warrants outstanding	4,899,497	4,899,497

Recent Accounting Pronouncements

3 Months Ended

Dec. 31, 2022

Accounting Changes And Error Corrections [Abstract]

Recent Accounting Pronouncements

In March 2020, the FASB issued ASU 2020-04, Reference Rate Reform (Topic 848) (“ASU 2020-04”). This ASU provides optional expedients and exceptions for a limited period of time for accounting for contracts, hedging relationships, and other transactions affected by the London Interbank Offered Rate (LIBOR), or another reference rate expected to be discontinued. Optional expedients can be applied through December 31, 2024. We are currently evaluating the impact that the new guidance will have on our consolidated financial statements.

In June 2022, the FASB issued new guidance to clarify the fair value measurement guidance for equity securities subject to contractual restrictions that prohibit the sale of an equity security. Further, the guidance introduces new disclosure requirements for equity securities subject to contractual sale restrictions that are measured at fair value. The standard will be effective for annual reporting periods beginning after December 15, 2023, including interim reporting periods within those fiscal years. We are currently evaluating the impact that the new guidance will have on our consolidated financial statements.

- Definition

The entire disclosure for change in accounting principle. Includes, but is not limited to, nature, reason, and method of adopting amendment to accounting standards or other change in accounting principle.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-URI https://asc.fasb.org/topic&trid=2122394

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 105
-SubTopic 10
-Section 65
-Paragraph 6
-Subparagraph (f)
-URI https://asc.fasb.org/extlink&oid=126987489&loc=SL124442142-165695

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 20
-Section 65
-Paragraph 2
-Subparagraph (d)(1)
-URI https://asc.fasb.org/extlink&oid=126986314&loc=SL124402458-218513

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 40
-Section 65
-Paragraph 2
-Subparagraph (g)(2)(iii)
-URI https://asc.fasb.org/extlink&oid=124501264&loc=SL117420844-207641

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)(4)
-URI https://asc.fasb.org/extlink&oid=124431687&loc=d3e22499-107794

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 40
-Section 65
-Paragraph 2
-Subparagraph (g)(2)(ii)
-URI https://asc.fasb.org/extlink&oid=124501264&loc=SL117420844-207641

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 40
-Section 65
-Paragraph 2
-Subparagraph (g)(2)(i)
-URI https://asc.fasb.org/extlink&oid=124501264&loc=SL117420844-207641

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 40
-Section 65
-Paragraph 1
-Subparagraph (e)(1)
-URI https://asc.fasb.org/extlink&oid=126732423&loc=SL123482106-238011

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 20
-Section 65
-Paragraph 2
-Subparagraph (d)(2)
-URI https://asc.fasb.org/extlink&oid=126986314&loc=SL124402458-218513

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 40
-Section 65
-Paragraph 2
-Subparagraph (g)(2)(iv)
-URI https://asc.fasb.org/extlink&oid=124501264&loc=SL117420844-207641

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section S99
-Paragraph 5
-Subparagraph (SAB Topic 11.M.Q2)
-URI https://asc.fasb.org/extlink&oid=122038215&loc=d3e31137-122693

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 10
-Section 65
-Paragraph 4
-Subparagraph (e)(1)
-URI https://asc.fasb.org/extlink&oid=122640432&loc=SL121648383-210437

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 40
-Section 65
-Paragraph 2
-Subparagraph (h)(2)
-URI https://asc.fasb.org/extlink&oid=124501264&loc=SL117420844-207641

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 10
-Section 65
-Paragraph 4
-Subparagraph (e)(2)
-URI https://asc.fasb.org/extlink&oid=122640432&loc=SL121648383-210437

Reference 15: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 848
-SubTopic 10
-Section 65
-Paragraph 1
-Subparagraph (e)(1)
-URI https://asc.fasb.org/extlink&oid=125980421&loc=SL122150809-237846

Reference 16: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 65
-Paragraph 8
-Subparagraph (e)(2)
-URI https://asc.fasb.org/extlink&oid=126983759&loc=SL121830611-158277

Reference 17: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section S99
-Paragraph 6
-URI https://asc.fasb.org/extlink&oid=122038215&loc=SL108384541-122693

Reference 18: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 10
-Section 65
-Paragraph 5
-Subparagraph (f)(1)
-URI https://asc.fasb.org/extlink&oid=128293352&loc=SL126838806-209984

Reference 19: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 65
-Paragraph 6
-Subparagraph (e)(2)
-URI https://asc.fasb.org/extlink&oid=126983955&loc=SL121967933-165497

Reference 20: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 40
-Section 65
-Paragraph 2
-Subparagraph (c)(2)
-URI https://asc.fasb.org/extlink&oid=126732423&loc=SL126732908-238011

Reference 21: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 10
-Section 65
-Paragraph 5
-Subparagraph (f)(3)
-URI https://asc.fasb.org/extlink&oid=128293352&loc=SL126838806-209984

Reference 22: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 40
-Section 65
-Paragraph 2
-Subparagraph (c)(1)
-URI https://asc.fasb.org/extlink&oid=126732423&loc=SL126732908-238011

Reference 23: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 65
-Paragraph 6
-Subparagraph (e)(1)
-URI https://asc.fasb.org/extlink&oid=126983955&loc=SL121967933-165497

Reference 24: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 65
-Paragraph 8
-Subparagraph (e)(1)
-URI https://asc.fasb.org/extlink&oid=126983759&loc=SL121830611-158277

Reference 25: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 40
-Section 65
-Paragraph 2
-Subparagraph (c)(3)
-URI https://asc.fasb.org/extlink&oid=126732423&loc=SL126732908-238011

Reference 26: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 926
-SubTopic 20
-Section 65
-Paragraph 2
-Subparagraph (f)(1)
-URI https://asc.fasb.org/extlink&oid=120154821&loc=SL120154904-197079

Reference 27: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 926
-SubTopic 20
-Section 65
-Paragraph 2
-Subparagraph (f)(2)
-URI https://asc.fasb.org/extlink&oid=120154821&loc=SL120154904-197079

Reference 28: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=124431687&loc=d3e22499-107794

Reference 29: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 926
-SubTopic 20
-Section 65
-Paragraph 2
-Subparagraph (f)(3)
-URI https://asc.fasb.org/extlink&oid=120154821&loc=SL120154904-197079

Reference 30: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 65
-Paragraph 6
-Subparagraph (e)(3)
-URI https://asc.fasb.org/extlink&oid=126983955&loc=SL121967933-165497

Reference 31: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 848
-SubTopic 10
-Section 65
-Paragraph 2
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=125980421&loc=SL125981372-237846

Reference 32: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-URI https://asc.fasb.org/extlink&oid=124431687&loc=d3e22499-107794

Reference 33: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)(1)
-URI https://asc.fasb.org/extlink&oid=124431687&loc=d3e22499-107794

Reference 34: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 65
-Paragraph 8
-Subparagraph (e)(3)
-URI https://asc.fasb.org/extlink&oid=126983759&loc=SL121830611-158277

+ Details

Employee Stock Purchase Plan

3 Months Ended

Dec. 31, 2022

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Employee Stock Purchase Plan

14.

Employee Stock Purchase Plan

2019 ESPP

The Mesa Air Group, Inc. 2019 Employee Stock Purchase Plan ("2019 ESPP”) is a nonqualified plan that provides eligible employees of Mesa Air Group, Inc. with an opportunity to purchase Mesa Air Group, Inc. ordinary shares through payroll deductions. Under the 2019 ESPP, eligible employees may elect to contribute 1% to 15% of their eligible compensation during each semi-annual offering period to purchase Mesa Air Group, Inc. ordinary shares at a 10% discount.

A maximum of 500,000 Mesa Air Group, Inc. ordinary shares may be issued under the 2019 ESPP. As of December 31, 2022, eligible employees purchased and we issued an aggregate of 304,137 Mesa Air Group, Inc. ordinary shares under the 2019 ESPP.

Long-Term Debt, Finance Leases, and Other Borrowings (Tables)

3 Months Ended

Dec. 31, 2022

Debt Disclosure [Abstract]

Schedule of Long-term Debt

Long-term debt as of December 31, 2022 and September 30, 2022, consisted of the following (in thousands):


	December 31,			September 30,
	2022			2022

Senior and subordinated notes payable to secured parties, due in monthly installments, interest based on LIBOR plus interest spread at 2.71% through 2027, collateralized by the underlying aircraft	$	69,919		$	73,850
Notes payable to secured parties, due in semi-annual installments, interest based on LIBOR plus interest spread at 4.75% to 6.25% through 2028, collateralized by the underlying aircraft		131,010			131,010
Notes payable to secured parties, due in quarterly installments, interest based on LIBOR plus interest at spread 2.20% to 2.32% for senior note & 4.50% for subordinated note through 2028, collateralized by the underlying aircraft		102,802			106,865
Other obligations due to financial institution, monthly and/or quarterly interest due from 2022 through 2031, collateralized by the underlying equipment		80,117			18,038
Notes payable to financial institution, due in monthly installments, interest based on LIBOR plus interest spread at 3.10% through 2024, collateralized by the underlying equipment		21,891			26,758
Notes payable to financial institution, due in monthly installments, plus interest spread at 5.00% through 2023, secured by flight equipment		1,500			2,000
Revolving credit facility, monthly interest based on LIBOR plus interest spread at 3.50% through 2022, collateralized by the underlying equipment and investments		41,130			15,630
Notes payable to financial institution, quarterly interest based on LIBOR plus interest spread at 3.50% through 2027		204,947			204,947
Notes payable to financial institution, due in monthly installments, interest based on LIBOR plus interest spread at 4.24%, through 2027, collateralized by the underlying equipment		48,031			36,212
Gross long-term debt, including current maturities		701,347			615,310
Less unamortized debt issuance costs		(8,051	)		(8,303	)
Less notes payable warrants		(6,678	)		(7,272	)
Net long-term debt, including current maturities		686,618			599,735
Less current portion, net of unamortized debt issuance costs		(88,802	)		(97,218	)
Net long-term debt	$	597,816		$	502,517

Schedule of Principal Maturities of Long-term Debt

Principal maturities of long-term debt as of December 31, 2022, and for each of the next five years are as follows (in thousands):


Periods Ending December 31,	Total Principal
2023 (remainder of)	$	73,863
2024		136,272
2025		64,952
2026		274,107
2027		81,106
Thereafter		71,047
	$	701,347

Intangible Assets

3 Months Ended

Dec. 31, 2022

Goodwill And Intangible Assets Disclosure [Abstract]

Intangible Assets

Information about our intangible assets as of December 31, 2022 and September 30, 2022, is as follows (in thousands):


	December 31,			September 30,
	2022			2022
Customer relationship	$	43,800		$	43,800
Accumulated amortization		(38,152	)		(38,029	)
Impairment		(5,648	)		(1,929	)
Net carrying value	$	—		$	3,842

Total amortization expense recognized was $0.1 million and $0.3 million for the three months ended December 31, 2022 and 2021, respectively. The Company recognized an impairment loss of $3.7 million on the customer relationship related to the American CPA during the three months ended December 31, 2022, which was recorded in asset impairment on our condensed consolidated statements of operations and comprehensive loss. Accordingly, we expect to record amortization expense of zero for the remainder of 2023 and thereafter.

As of December 31, 2022, our intangible assets’ remaining amortization term is 0.0 years.

Share-Based Compensation and Stock Repurchases - Schedule of Restricted Share Activity (Detail) - Restricted Stock [Member]	3 Months Ended
	Dec. 31, 2022 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Unvested, Beginning Balance \| shares	1,172,493
Number of Shares, Vested \| shares	(2,500)
Number of Shares, Unvested, Ending Balance \| shares	1,169,993
Weighted-Average Grant Date Fair Value, Unvested, Beginning Balance \| $ / shares	$ 4.43
Weighted-Average Grant Date Fair Value, Vested \| $ / shares	1.37
Weighted-Average Grant Date Fair Value, Unvested, Ending Balance \| $ / shares	$ 4.44

Summary of Significant Accounting Policies (Policies)

3 Months Ended

Dec. 31, 2022

Accounting Policies [Abstract]

Basis of Presentation

The accompanying condensed consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America ("GAAP") and include the accounts of the Company and its wholly owned operating subsidiaries. Any reference in these notes to applicable guidance is meant to refer to the authoritative GAAP as found in the Accounting Standards Codification ("ASC") and Accounting Standards Update ("ASU") of the Financial Accounting Standards Board ("FASB"). All intercompany accounts and transactions have been eliminated in consolidation. Reclassifications of certain immaterial prior period amounts have been made to conform to the current period presentation.

These condensed consolidated financial statements should be read in conjunction with the Company's audited consolidated financial statements and notes thereto as of and for the year ended September 30, 2022 included in the Company's Annual Report on Form 10-K for the year ended September 30, 2022 on file with the U.S. Securities and Exchange Commission (the "SEC"). Information and footnote disclosures normally included in financial statements have been condensed or omitted in these condensed consolidated financial statements pursuant to the rules and regulations of the SEC and GAAP. These condensed consolidated financial statements reflect all adjustments that, in the opinion of management, are necessary to present fairly the results of operations for the interim periods presented.

Segment Reporting

As of December 31, 2022, our chief operating decision maker was the Chief Executive Officer. While we operate under two separate capacity purchase agreements and a flight services agreement, we do not manage our business based on any performance measure at the individual contract level. Our chief operating decision maker uses consolidated financial information to evaluate our performance and allocate resources, which is the same basis on which he communicates our results and performance to our Board of Directors. Accordingly, we have a single operating and reportable segment.

Use of Estimates

The preparation of the Company's condensed consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues, and expenses and the disclosure of contingent assets and liabilities at the date of the condensed consolidated financial statements. Actual results could differ from those estimates.

Contract Revenue and Pass-through and Other Revenue

We recognize contract revenue when the service is provided under our CPAs and FSA. Under the CPAs and FSA, our major partners generally pay for each departure, flight hour or block hour incurred, and an amount per aircraft in service each month with additional incentives or penalties based on flight completion, on-time performance, and other operating metrics. Our performance obligation is met as each flight is completed, and revenue is recognized and reflected in contract revenue.

We recognize pass-through revenue when the service is provided under our CPAs and FSA. Pass-through revenue represents reimbursements for certain direct expenses incurred including passenger liability and hull insurance, property taxes, other direct costs defined within the agreements, and major maintenance on aircraft leased from our major partners at nominal rates. Our performance obligation is met when each flight is completed or as the maintenance services are performed, and revenue is recognized and reflected in pass-through and other revenue.

We record deferred revenue when cash payments are received or are due from our major partners in advance of our performance. During the three months ended December 31, 2022, we recognized $5.3 million of previously deferred revenue. Deferred revenue is recognized as flights are completed over the remaining terms of the respective contracts.

The deferred revenue balance as of December 31, 2022 represents our aggregate remaining performance obligations that will be recognized as revenue over the period in which the performance obligations are satisfied, and is expected to be recognized as revenue as follows (in thousands):


Periods Ending December 31,	Total Revenue
2023 (remainder of)	$	691
2024		3,214
2025		4,810
2026		4,024
2027		3,675
Thereafter		2,397
Total	$	18,811

A portion of our compensation under our CPAs with American and United is designed to reimburse the Company for certain aircraft ownership costs. Such costs include aircraft principal and interest debt service costs, aircraft depreciation, and interest expense or aircraft lease expense costs while the aircraft is under contract. We have concluded this component of the compensation under these agreements is lease revenue, as such agreements identify the "right of use" of a specific type and number of aircraft over a stated period of time. We account for the non-lease component under ASC 606 and account for the lease component under ASC 842. We allocate the consideration in the contract between the lease and non-lease components based on their stated contract prices, which is based on a cost basis approach representing our estimate of the stand-alone selling prices.

The lease revenue associated with our CPAs is accounted for as an operating lease and is reflected as contract revenue in the condensed consolidated statements of operations and comprehensive loss. We recognized $41.1 million and $40.3 million of lease revenue for the three months ended December 31, 2022 and 2021, respectively. We have not separately stated aircraft rental income in the condensed consolidated statements of operations and comprehensive loss because the use of the aircraft is not a separate activity from the total service provided under our CPAs.

Historically, the Company has lease agreements with GoJet Airlines LLC (“GoJet”) to lease 20 CRJ-700 aircraft. The lease agreements are accounted for as operating leases and have a term of nine (9) years beginning on the delivery date of each aircraft. Under the lease agreements, GoJet pays fixed monthly rent per aircraft and variable lease payments for supplemental rent based on monthly aircraft utilization at fixed rates. Supplemental rent payments are subject to reimbursement following GoJet’s completion of qualifying maintenance events defined in the agreements. Lease revenue for fixed monthly rent payments is recognized ratably within contract revenue. Lease revenue for supplemental rent is deferred and recognized within contract revenue when it is probable that amounts received will not be reimbursed for future qualifying maintenance events over the lease term.

The Company mitigated the residual asset risks through supplemental rent payments and by leasing aircraft and engine types that can be operated by the Company in the event of a default. Additionally, the leases have specified lease return condition requirements and we maintain inspection rights under the leases. Lease incentive obligations for reimbursements of certain aircraft maintenance costs are recognized as lease incentive assets and were amortized on a straight-line basis and recognized as a reduction to lease revenue over the lease term.

During fiscal year 2022, the Company terminated its lease agreement with GoJet to lease 18 of the 20 CRJ-700 aircraft and classified the 18 aircraft as assets held for sale, of which ten (10) were sold. The sale of the remaining eight (8) aircraft assets held for sale (see Note 6) closed in January 2023. The remaining two (2) lease agreements are accounted for as finance leases.

The following table summarizes future minimum rental income under operating leases related to leased aircraft that had remaining non-cancelable lease terms as of December 31, 2022 (in thousands):


Periods Ending December 31,	Total Payments
2023 (remainder of)	$	1,638
2024		2,184
2025		2,184
2026		2,184
2027		2,184
Thereafter		8,008
Total	$	18,382

Leases

We determine if an arrangement is a lease at inception. As a lessee, we have lease agreements with lease and non-lease components and have elected to account for such components as a single lease component. Our operating lease activities are recorded in operating lease right-of-use assets, current maturities of operating leases, and noncurrent operating lease liabilities in the condensed consolidated balance sheets. Finance leases are reflected in property and equipment, net, current portion of long-term debt and finance leases, and long-term debt and finance leases, excluding current portion in the condensed consolidated balance sheets.

Right-of-use (“ROU”) assets represent our right to use an underlying asset for the lease term and lease liabilities represent our obligation to make lease payments arising from the lease. ROU assets and lease liabilities are recognized at the lease commencement date based on the present value of lease payments over the lease term. Certain variable lease payments are not included in the calculation of the right-of-use assets and lease liability due to uncertainty of the payment amount and are recorded as lease expense in the period incurred. In determining the present value of lease payments, we use either the implicit rate in the lease when it is readily determinable or our estimated incremental borrowing rate, based on information available at the lease commencement. Our lease terms include options to extend or terminate the lease when it is reasonably certain that we will exercise that option. Operating lease costs are recognized on a straight-line basis over the lease term, while finance leases result in a front-loaded expense pattern.

As a lessee, we have elected a short-term lease practical expedient on all classes of underlying assets, permitting us to not apply the recognition requirements of ASC 842 to leases with terms of 12 months or less.

We lease, at nominal rates, certain aircraft from United and DHL under our United CPA and DHL FSA, which are excluded from operating lease assets and liabilities as they do not represent embedded leases under ASC 842. Other than such leases at nominal amounts, approximately 11% of our aircraft are leased from third parties. All of our aircraft leases have been classified as operating leases, which results in rental payments being charged to expense over the term of the related leases. In the event that we or one of our major partners decide to exit an activity involving leased aircraft, losses may be incurred. In the event that we exit an activity that results in exit losses, these losses are accrued as each aircraft is removed from operations for early termination penalties, lease settle up and other charges. Additionally, any remaining ROU assets and lease liabilities are written off.

The majority of our leased aircraft are leased through trusts that have a sole purpose to purchase, finance, and lease these aircraft to us; therefore, they meet the criteria of a variable interest entity. However, since these are single-owner trusts in which we do not participate, we are not at risk for losses and are not considered the primary beneficiary. Management believes that our maximum exposure under these leases is the remaining lease payments.

Contract Liabilities

Contract liabilities consist of deferred credits for cost reimbursements from major partners related to aircraft modifications and pilot training associated with capacity purchase agreements. The deferred credits are recognized over time depicting the pattern of the transfer of control of services resulting in ratable recognition of revenue over the remaining term of the capacity purchase agreements.

Current and non-current deferred credits are recorded in other accrued expenses and non-current deferred credits in the condensed consolidated balance sheets. Our total current and non-current deferred credit balances at December 31, 2022 and September 30, 2022 were $3.7 million and $3.9 million, respectively. We recognized $0.2 million and $0.2 million of the deferred credits within contract revenue during the three months ended December 31, 2022 and 2021, respectively.

Maintenance Expense

We operate under an FAA approved continuous inspection and maintenance program. The cost of non-major scheduled inspections and repairs and routine maintenance costs for all aircraft and engines are charged to maintenance expense as incurred.

We account for heavy maintenance and major overhaul costs on our owned E-175 fleet under the deferral method whereby the cost of heavy maintenance and major overhaul is deferred and amortized until the earlier of the end of the useful life of the related asset or the next scheduled heavy maintenance event. Amortization of heavy maintenance and major overhaul costs charged to depreciation and amortization expense was $0.8 million and $0.2 million for the three months ended December 31, 2022 and 2021, respectively. As of December 31, 2022 and September 30, 2022, our deferred heavy maintenance balance, net of accumulated amortization, was $10.3 million and $9.7 million, respectively.

We account for heavy maintenance and major overhaul costs for all other fleets under the direct expense method whereby costs are expensed to maintenance expense as incurred, except for certain maintenance contracts where labor and materials price risks have been transferred to the service provider and require payment on a utilization basis, such as flight hours. Costs incurred for maintenance and repair for utilization maintenance contracts where labor and materials price risks have been transferred to the service provider are charged to maintenance expense based on contractual payment terms.

Engine overhaul expense totaled $8.7 million and $5.3 million for the three months ended December 31, 2022 and 2021, respectively, of which $8.7 million and $3.8 million, respectively, was pass-through expense. Airframe C-check expense totaled $5.1 million and $9.1 million for the three months ended December 31, 2022 and 2021, respectively, of which $4.4 million and $0.0 million, respectively, was pass-through expense.

Assets Held for Sale

We classify assets as held for sale when our management approves and commits to a formal plan of sale that is probable of being completed within one year. Assets designated as held for sale are recorded at the lower of their current carrying value or their fair market value, less costs to sell, beginning in the period in which the assets meet the criteria to be classified as held for sale. See Note 6 for further discussion of our assets classified as held for sale as of December 31, 2022.

Leases

3 Months Ended

Dec. 31, 2022

Leases [Abstract]

Leases

15.

Leases

As of December 31, 2022, we leased 17 aircraft, airport facilities, office space, and other property and equipment under non-cancelable operating leases. The leases generally require us to pay all taxes, maintenance, insurance, and other operating expenses. Rental expense is recognized on a straight-line basis over the lease term, net of lessor rebates and other incentives. We expect that, in the normal course of business, such operating leases that expire will be renewed or replaced by other leases, or the property may be purchased rather than leased.

Aggregate rental expense under all operating aircraft, equipment and facility leases totaled approximately $6.9 million and $11.8 million for the three months ended December 31, 2022 and 2021, respectively.

The components of our operating lease costs were as follows (in thousands):


	Three Months Ended December 31,
	2022		2021
Operating lease costs	$	4,699	$	9,480
Variable and short-term lease costs		889		1,735
Interest expense on finance lease liabilities		274		100
Amortization expense of finance lease assets		1,046		533
Total lease costs	$	6,907	$	11,848

As of December 31, 2022, our operating leases have a remaining weighted average lease term of 6.0 years and our operating lease liabilities were measured using a weighted average discount rate of 4.8%.

Due to the impacts of the pilot shortage and the pilot wage increase, we evaluated all asset groups during the fiscal year ended September 30, 2022 and determined that only the asset group associated with the CRJ-900 fleet operating under the American CPA, discussed in Note 7, required impairment. As of the three months ended December 31, 2022, we determined zero further impairment is required within the asset group for the CRJ-900 fleet on our condensed consolidated statements of operations and comprehensive loss. Additionally, during the three months ended December 31, 2022, we recorded a zero impairment of certain operating lease ROU assets associated with the abandonment of a leased facility. The Company did not record any impairment losses related to its operating lease right-of-use assets during the three months ended December 31, 2021.

RASPRO Lease Facility

Historically, Mesa Airlines, as lessee, entered into the RASPRO Lease Facility, with RASPRO as lessor, for 15 of our CRJ-900 aircraft classified as operating leases. The obligations under the RASPRO Lease Facility are guaranteed by us, and basic rent is paid quarterly on each aircraft. During December 2022, the Company entered into an agreement with RASPRO Trust, reducing the buyout pricing on all 15 aircraft at lease termination by a total of $25 million. Under the terms of the new agreement, the Company reclassified these leases as finance leases.

Employee Stock Purchase Plan - Additional Information (Detail) - 2019 ESPP [Member]	3 Months Ended
	Dec. 31, 2022 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Ordinary shares, discount rate	10.00%
Number of ordinary shares issued	304,137
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Eligible employees contribution from their eligible compensation during each semi annual	1.00%
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Eligible employees contribution from their eligible compensation during each semi annual	15.00%
Number of ordinary shares issued	500,000

Summary of Significant Accounting Policies - Additional Information (Detail) $ in Millions		3 Months Ended		12 Months Ended
	Jan. 31, 2023 AirCraft	Dec. 31, 2022 USD ($) AirCraft	Dec. 31, 2021 USD ($)	Sep. 30, 2022 USD ($) AirCraft
Summary Of Significant Accounting Policies [Line Items]
Deferred revenue		$ 5.3
Lease revenue		$ 41.1	$ 40.3
Operating Lease, Lease Income, Statement of Income or Comprehensive Income [Extensible Enumeration]		Revenue From Contract With Customer Excluding Assessed Tax	Revenue From Contract With Customer Excluding Assessed Tax
Current and non-current deferred credit contract liability balances		$ 3.7		$ 3.9
Recognized deferred credits within contract revenue		0.2	$ 0.2
Amortization of heavy maintenance and major overhaul costs charged to depreciation and amortization expense		0.8	0.2
Deferred heavy maintenance balance, net of accumulated amortization		10.3		$ 9.7
Engine overhaul expense		8.7	5.3
Engine overhaul pass-through expense		8.7	3.8
Airframe check expense		5.1	9.1
Airframe check pass-through expense		$ 4.4	$ 0.0
Aircraft [Member]
Summary Of Significant Accounting Policies [Line Items]
Percentage leased		11.00%
CRJ 700 [Member]
Summary Of Significant Accounting Policies [Line Items]
Number of aircraft to be leased \| AirCraft		20		20
Operating lease, term of contract		9 years
CRJ 700 [Member] \| GoJet Agreements [Member]
Summary Of Significant Accounting Policies [Line Items]
Number of aircraft classified as assets held for sale \| AirCraft				18
Number of aircraft sold \| AirCraft				10
Subsequent Event [Member] \| CRJ 700 [Member]
Summary Of Significant Accounting Policies [Line Items]
Number of aircraft classified as assets held for sale \| AirCraft	8
Number of aircraft sold \| AirCraft	8

Balance Sheet Information

3 Months Ended

Dec. 31, 2022

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Balance Sheet Information

Certain significant amounts included in the condensed consolidated balance sheets consisted of the following (in thousands):


	December 31,			September 30,
	2022			2022
Expendable parts and supplies, net:
Expendable parts and supplies	$	32,013		$	31,913
Less: obsolescence and other		(6,504	)		(5,198	)
	$	25,509		$	26,715
Prepaid expenses and other current assets:
Prepaid aviation insurance	$	1,026		$	2,618
Prepaid vendors		906			1,310
Prepaid other insurance		798			1,268
Lease incentives		143			352
Prepaid fuel and other		1,080			1,068
	$	3,953		$	6,616
Property and equipment, net:
Aircraft and other flight equipment	$	1,354,137		$	1,260,143
Other equipment		5,709			5,577
Leasehold improvements		2,776			2,776
Vehicles		1,003			992
Building		777			777
Furniture and fixtures		298			298
Total property and equipment		1,364,700			1,270,563
Less: accumulated depreciation		(419,155	)		(405,309	)
	$	945,545		$	865,254
Other assets:
Investments in equity securities	$	13,408		$	15,178
Lease incentives		1,061			1,097
Other		515			15
	$	14,984		$	16,290
Other accrued expenses:
Accrued property taxes	$	6,066		$	5,866
Accrued interest		5,016			2,882
Accrued vacation		7,768			4,746
Accrued lodging		3,529			3,795
Accrued maintenance		2,154			1,453
Accrued liability on government payroll program		—			2,967
Accrued simulator costs		149			1,045
Accrued employee benefits		1,097			1,679
Accrued fleet operating expense		1,232			1,606
Other		3,550			2,961
	$	30,561		$	29,000
Other noncurrent liabilities:
Warrant liabilities	$	25,225		$	25,225
Lease incentive obligations		1,050			1,050
Long-term employee benefits		843			1,123
Other		1,820			1,821
	$	28,938		$	29,219

Impairment of Long-lived Assets

The Company monitors for any indicators of impairment of the long-lived fixed assets. When certain conditions or changes in the economic situation exist, the assets may be impaired and the carrying amount of the assets exceed their fair value. The assets are then tested for recoverability of carrying amount. The Company records impairment charges on long-lived assets used in operations when events and circumstances indicate that the assets may be impaired, the undiscounted net cash flows estimated to be generated by those assets are less than the carrying amount of those assets, and the net book value of the assets exceeds their estimated fair value.

We group assets at the capacity purchase agreement, flight services agreement, and fleet-type level (i.e., the lowest level for which there are identifiable cash flows). If impairment indicators exist with respect to any of the asset groups, we estimate future cash flows based on projections of capacity purchase or flight services agreement, block hours, maintenance events, labor costs and other relevant factors.

During the fiscal year ended September 30, 2022, due to the impacts of the pilot shortage and the pilot wage increase, the Company assessed whether any indicators of impairment existed in any of our long-lived asset groups. The Company concluded there was impairment of its American asset group and recorded it as asset impairment in our condensed consolidated statements of operations and comprehensive loss.

During the three months ended December 31, 2022, the Company qualitatively evaluated indictors of impairment and concluded that the remaining carrying value of the American intangible asset required impairment. The Company recognized a total impairment loss of $3.7 million related to the American intangible asset in the condensed consolidated statements of operations and comprehensive loss. The Company determined that no other indicators of impairment were present during the quarter and no further steps were determined to be necessary. The Company did not record any impairment losses related to its long-lived assets during the three months ended December 31, 2021.

The Company’s assumptions about future conditions relevant to the assessment of potential impairment of its long-lived assets, including the impact of the COVID-2019 pandemic to its business, are subject to uncertainty, and the Company will continue to monitor these conditions in future periods as new information becomes available, and will update its analyses accordingly.

Depreciation Expense on Property and Equipment:

Depreciation of property and equipment totaled $14.4 million and $20.5 million for the three months ended December 31, 2022 and 2021, respectively.

Other Assets

In connection with a negotiated forward purchase contract for electrically-powered vertical takeoff and landing aircraft (“eVTOL aircraft”) executed in February 2021, we obtained equity warrant assets giving us the right to acquire a number shares of common stock in Archer Aviation, Inc. (“Archer”), which at the time of our initial investment was a private, venture-backed company. As the initial investment in Archer did not have a readily determinable fair value, we accounted for this investment using the measurement alternative under ASC 321, Investments – Equity Securities, and measured the investments at cost less impairment, if any, plus or minus changes resulting from observable price changes in orderly transactions for identical or similar investments from the same issuer. We estimated the initial equity warrant asset value to be $16.4 million based on publicly available information as of the grant date. In September 2021, the merger between Archer and a special purpose acquisition company (“SPAC”) was completed, resulting in a readily determinable fair value of our investments in Archer. Accordingly, gains and losses associated with changes in the fair value of our investments in Archer are measured in earnings, in accordance with ASC 321.

The initial grant date values of the warrants, $16.4 million, was recognized as a vendor credit liability within other noncurrent liabilities. The liability related to the warrant assets will be settled in the future, as a reduction of the acquisition date value of the eVTOL aircraft contemplated in the related aircraft purchase agreement.

In connection with closing of the merger between Archer and the SPAC described above, in September 2021, we purchased 500,000 Class A common shares in Archer for $5.0 million and obtained an additional warrant to purchase shares of Archer with a total grant date value of $5.6 million. The initial value of the warrants was recognized as a vendor credit liability within other noncurrent liabilities, and will be settled in the future, as a reduction of the acquisition date value of the eVTOL aircraft contemplated in the related aircraft purchase agreement. Because these investments have readily determinable fair values, gains and losses resulting from changes in fair value of the investments are reflected in earnings, in accordance with ASC 321. All of our vested warrants have been exercised into shares of Archer common stock.

The fair values of the Company’s investments in Archer are Level 1 within the fair value hierarchy as the values are determined using quoted prices for the equity securities.

In connection with a negotiated forward purchase contract for fully electric aircraft executed in July 2021, we obtained $5.0 million of preferred stock in Heart Aerospace Incorporated (“Heart”), a privately held company. Our investment in Heart does not have a readily determinable fair value, so we account for the investment using the measurement alternative under ASC 321 and measure the investment at initial cost less impairment, if any, plus or minus changes resulting from observable price changes in orderly transactions for identical or similar investments from the same issuer. We consider a range of factors when adjusting the fair value of these investments, including, but not limited to, the term and nature of the investment, local market conditions, values for comparable securities, current and projected operating performance, financing transactions subsequent to the acquisition of the investment, or other features that indicate a change to fair value is warranted. Any changes in fair value from the initial cost of the investment in preferred stock are recognized as increases or decreases on our balance sheet and as net gains or losses on investments in equity securities. The initial investment in preferred stock was measured at cost of $5.0 million.

In connection with a negotiated forward purchase contract for hybrid-electric vertical takeoff and landing (“VTOL”) aircraft executed in February 2022, we obtained a warrant giving us the right to acquire a number of shares of common stock in the privately-held manufacturer of the VTOL aircraft. These investments do not have a readily determinable fair value, so we account for them using the measurement alternative under ASC 321 and measure the investments at cost less impairment, if any, plus or minus changes resulting from observable price changes in orderly transactions for identical or similar investments from the same issuer. We consider a range of factors when adjusting the fair value of these investments, including, but not limited to, the term and nature of the investment, local market conditions, values for comparable securities, current and projected operating performance, financing transactions subsequent to the acquisition of the investment or other features that indicate a discount to fair value is warranted. Any changes in fair value from the grant date value of the warrant assets will be recognized as increases or decreases to the investment on our balance sheet and as net gains or losses on investments equity securities. We estimated the initial warrant asset value to be $3.2 million based on prices of similar investments in the same issuer. The grant date value of the warrants, $3.2 million, was recognized as a vendor credit liability within other noncurrent liabilities. The liability related to the warrant assets will be settled in the future, as a reduction of the acquisition date value of the VTOL aircraft contemplated in the related forward purchase agreement.

Total net losses on our investments in equity securities totaled $1.7 million and $6.5 million during the three months ended December 31, 2022 and 2021, respectively, and are reflected in loss on investments, net in our condensed consolidated statements of operations and comprehensive loss. As of December 31, 2022, the aggregate carrying amount of our investments in equity securities was $13.4 million, and the carrying amount of our investments without readily determinable fair values was $9.0 million.

Intangible Assets (Tables)

3 Months Ended

Dec. 31, 2022

Goodwill And Intangible Assets Disclosure [Abstract]

Information About Intangible Assets

Information about our intangible assets as of December 31, 2022 and September 30, 2022, is as follows (in thousands):


	December 31,			September 30,
	2022			2022
Customer relationship	$	43,800		$	43,800
Accumulated amortization		(38,152	)		(38,029	)
Impairment		(5,648	)		(1,929	)
Net carrying value	$	—		$	3,842

Long-Term Debt, Finance Leases, and Other Borrowings - Schedule of Long-term Debt (Parenthetical) (Detail)	3 Months Ended	12 Months Ended
	Dec. 31, 2022	Sep. 30, 2022
Revolving Credit Facility, Monthly Collateralized by Underlying Equipment and Investments, Through 2022 [Member]
Debt Instrument [Line Items]
Debt instrument maturity year	2022	2022
Long term debt interest rate description	monthly interest based on LIBOR plus interest spread at 3.50%
LIBOR [Member] \| Revolving Credit Facility, Monthly Collateralized by Underlying Equipment and Investments, Through 2022 [Member]
Debt Instrument [Line Items]
Long term debt, basis spread on variable rate	3.50%
Senior and Subordinated Notes Payable to Secured Parties, Due in Monthly Installments Collateralized by the Underlying Aircraft Through 2027 [Member]
Debt Instrument [Line Items]
Debt instrument maturity year	2027	2027
Long term debt interest rate description	due in monthly installments, interest based on LIBOR plus interest spread at 2.71%
Senior and Subordinated Notes Payable to Secured Parties, Due in Monthly Installments Collateralized by the Underlying Aircraft Through 2027 [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Long term debt, basis spread on variable rate	2.71%
Notes Payable to Secured Parties, Due in Semi Annual Installments Collateralized by the Underlying Aircraft Through 2028 [Member]
Debt Instrument [Line Items]
Debt instrument maturity year	2028	2028
Long term debt interest rate description	due in semi-annual installments, interest based on LIBOR plus interest spread at 4.75% to 6.25%
Notes Payable to Secured Parties, Due in Semi Annual Installments Collateralized by the Underlying Aircraft Through 2028 [Member] \| LIBOR [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Long term debt, basis spread on variable rate	4.75%
Notes Payable to Secured Parties, Due in Semi Annual Installments Collateralized by the Underlying Aircraft Through 2028 [Member] \| LIBOR [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Long term debt, basis spread on variable rate	6.25%
Notes Payable to Secured Parties, Due in Quarterly Installments Collateralized by the Underlying Aircraft Through 2028 [Member]
Debt Instrument [Line Items]
Debt instrument maturity year	2028	2028
Long term debt interest rate description	due in quarterly installments, interest based on LIBOR plus interest at spread 2.20% to 2.32% for senior note & 4.50% for subordinated note
Notes Payable to Secured Parties, Due in Quarterly Installments Collateralized by the Underlying Aircraft Through 2028 [Member] \| LIBOR [Member] \| Senior Subordinated Notes [Member]
Debt Instrument [Line Items]
Long term debt, basis spread on variable rate	4.50%
Notes Payable to Secured Parties, Due in Quarterly Installments Collateralized by the Underlying Aircraft Through 2028 [Member] \| LIBOR [Member] \| Minimum [Member] \| Senior Notes [Member]
Debt Instrument [Line Items]
Long term debt, basis spread on variable rate	2.20%
Notes Payable to Secured Parties, Due in Quarterly Installments Collateralized by the Underlying Aircraft Through 2028 [Member] \| LIBOR [Member] \| Maximum [Member] \| Senior Notes [Member]
Debt Instrument [Line Items]
Long term debt, basis spread on variable rate	2.32%
Notes Payable to Financial Institution, Due in Monthly Installments Collateralized by the Underlying Equipment, Through 2024 [Member]
Debt Instrument [Line Items]
Debt instrument maturity year	2024	2024
Long term debt interest rate description	due in monthly installments, interest based on LIBOR plus interest spread at 3.10%
Notes Payable to Financial Institution, Due in Monthly Installments Collateralized by the Underlying Equipment, Through 2024 [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Long term debt, basis spread on variable rate	3.10%
Other Obligations Due to Financial Institutions, Monthly or Quarterly Collateralized by the Underlying Equipment, Due 2022 Through 2031 [Member]
Debt Instrument [Line Items]
Long term debt interest rate description	monthly and/or quarterly interest due from 2022 through 2031
Other Obligations Due to Financial Institutions, Monthly or Quarterly Collateralized by the Underlying Equipment, Due 2022 Through 2031 [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Debt instrument maturity year	2022	2022
Other Obligations Due to Financial Institutions, Monthly or Quarterly Collateralized by the Underlying Equipment, Due 2022 Through 2031 [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt instrument maturity year	2031	2031
Notes Payable to Financial Institution, Due in Monthly Installments Secured by Flight Equipment, Through 2023 [Member]
Debt Instrument [Line Items]
Debt instrument maturity year	2023	2023
Long term debt interest rate description	due in monthly installments, plus interest spread at 5.00%
Notes Payable to Financial Institution, Due in Monthly Installments Secured by Flight Equipment, Through 2023 [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Long term debt, basis spread on variable rate	5.00%
Notes Payable to Financial Institution, Quarterly, Through 2027 [Member]
Debt Instrument [Line Items]
Debt instrument maturity year	2027	2027
Long term debt interest rate description	quarterly interest based on LIBOR plus interest spread at 3.50%
Notes Payable to Financial Institution, Quarterly, Through 2027 [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Long term debt, basis spread on variable rate	3.50%
Notes Payable to Financial Institution, Due in Monthly Installments Collateralized by the Underlying Equipment, Through 2027 [Member]
Debt Instrument [Line Items]
Debt instrument maturity year	2027	2027
Long term debt interest rate description	due in monthly installments, interest based on LIBOR plus interest spread at 4.24%
Notes Payable to Financial Institution, Due in Monthly Installments Collateralized by the Underlying Equipment, Through 2027 [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Long term debt, basis spread on variable rate	4.24%

Long-Term Debt, Finance Leases, and Other Borrowings - Schedule of Principal Maturities of Long-term Debt (Detail) - USD ($) $ in Thousands	Dec. 31, 2022	Sep. 30, 2022
Long Term Debt By Maturity [Abstract]
2023 (remainder of)	$ 73,863
2024	136,272
2025	64,952
2026	274,107
2027	81,106
Thereafter	71,047
Long-term debt	$ 701,347	$ 615,310

Share-Based Compensation and Stock Repurchases (Tables)

3 Months Ended

Dec. 31, 2022

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Schedule of Restricted Share Activity

The restricted share activity for the three months ended December 31, 2022 is summarized as follows:


				Weighted-
				Average
	Number			Grant Date
	of Shares			Fair Value
Restricted shares unvested at September 30, 2022		1,172,493		$	4.43
Granted		—		$	—
Vested		(2,500	)	$	1.37
Forfeited		—		$	—
Restricted shares unvested at December 31, 2022		1,169,993		$	4.44

Leases - Additional Information (Detail)	3 Months Ended
Leases - Additional Information (Detail)	Dec. 31, 2022 USD ($) AirCraft	Dec. 31, 2021 USD ($)
Lessee, Lease, Description [Line Items]
Number of leased aircraft \| AirCraft	17
Aggregate rental expense under all operating aircraft, equipment and facility leases \| $	$ 6,907,000	$ 11,848,000
Weighted average remaining lease term Operating leases	6 years
Weighted average discount rate Operating leases	4.80%
Impairment of certain operating lease ROU assets \| $		$ 0
RASPRO Aircraft Lease Agreement [Member]
Lessee, Lease, Description [Line Items]
Number of aircraft lease terminated \| AirCraft	15
Buyout pricing \| $	$ 25,000,000
RASPRO Aircraft Lease Agreement [Member] \| CRJ-900 Aircraft [Member]
Lessee, Lease, Description [Line Items]
Number of leased aircraft \| AirCraft	15

Intangible Assets - Additional Information (Detail) - USD ($)	3 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Impairment loss on intangible assets	$ 3,719,000
Amortization expense recognized	100,000	$ 300,000
Amortization expense for remainder of fiscal year and thereafter	$ 0
Intangible assets remaining amortization term	0 years
Customer Relationships [Member] \| American Capacity Purchase Agreement [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment loss on intangible assets	$ 3,700,000

Subsequent Events

3 Months Ended

Dec. 31, 2022

Subsequent Events [Abstract]

Subsequent Events

17.

Subsequent Events

Amendments to Bylaws

On January 13, 2023, the Company’s Board of Directors approved a resolution to amend the Company’s Amended and Restated Bylaws (the “Bylaws”) in connection with the Company’s entry into the Amended and Restated United CPA, see Note 1, which provides United with the right to designate one (1) representative to be a member of the Board, provided that United holds at least five percent (5%) of the issued and outstanding shares of capital stock of the Company, and provided that such United Designee shall be subject to the reasonable approval of the Board. Until the earlier of January 1, 2026, or the Company’s entry into a definitive binding agreement for the performance of regional airline services with a major air carrier other than United, the Board shall not take, or make any recommendation to the stockholders of the Company with respect to several actions, including:

•

Merge or consolidate any of the Company’s subsidiaries with or into any other entity, or sell, transfer or dispose of all or substantially all of the assets of the Company;

•

Enter into a purchase transaction that would result in the cash balance of the Company to fall below a certain threshold;

•

Enter into new lines of business, provided that this restriction shall not apply from and after the first point in time, if any, after the satisfaction of certain performance milestones; or

•

Amend or modify the Bylaws or Articles of Incorporation of the Company that would alter, amend, or repeal any of the foregoing.

Also on January 13, 2023, pursuant to the terms of the United CPA, the Company issued to United 4,042,061 shares of the Company’s common stock, no par value per share, equal to 10% of the Company’s issued and outstanding capital stock on such date. As set forth in the United CPA, the Company also granted United preemptive rights to purchase its pro rata portion of any equity securities that the Company may propose to issue or sell to any person in the future.

Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Sep. 30, 2022
Income Taxes [Line Items]
Effective tax rate (ETR) from continuing operations	9.30%	22.40%
State net operating loss carryforwards			$ 6.3
Domestic Tax Authority [Member] \| 2027-2038 [Member]
Income Taxes [Line Items]
Net operating loss carryforwards			591.4
State and Local Jurisdiction [Member] \| 2023-2043 [Member]
Income Taxes [Line Items]
Net operating loss carryforwards			$ 247.0
Minimum [Member] \| Domestic Tax Authority [Member]
Income Taxes [Line Items]
Operating loss carryforwards, expiration year			2027
Minimum [Member] \| State and Local Jurisdiction [Member]
Income Taxes [Line Items]
Operating loss carryforwards, expiration year			2023
Maximum [Member] \| Domestic Tax Authority [Member]
Income Taxes [Line Items]
Operating loss carryforwards, expiration year			2038
Maximum [Member] \| State and Local Jurisdiction [Member]
Income Taxes [Line Items]
Operating loss carryforwards, expiration year			2043

Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Number of Warrants [Member]	Common Stock and Additional Paid-In Capital [Member]	Retained Earnings [Member]
Beginning balance at Sep. 30, 2021	$ 488,047			$ 256,372	$ 231,675
Beginning balance, shares at Sep. 30, 2021		35,958,759	4,899,497
Stock compensation expense	716			716
Repurchased shares	(15)			(15)
Repurchased shares, shares		(2,275)
Restricted shares issued, shares		7,500
Net loss	(14,274)				(14,274)
Ending balance at Dec. 31, 2021	474,474			257,073	217,401
Ending balance, shares at Dec. 31, 2021		35,963,984	4,899,497
Beginning balance at Sep. 30, 2022	308,174			259,177	48,997
Beginning balance, shares at Sep. 30, 2022		36,376,897	4,899,497
Stock compensation expense	688			688
Repurchased shares	(1)	$ (1,000)		(1)
Repurchased shares, shares		(847)
Restricted shares issued, shares		2,500
Net loss	(9,090)				(9,090)
Ending balance at Dec. 31, 2022	$ 299,771			$ 259,864	$ 39,907
Ending balance, shares at Dec. 31, 2022		36,378,550	4,899,497

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(22))
-URI https://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-Subparagraph (f)
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8933-108599

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 4
-URI https://asc.fasb.org/extlink&oid=124431687&loc=d3e22595-107794

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(18))
-URI https://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 40
-Section 65
-Paragraph 1
-Subparagraph (f)
-URI https://asc.fasb.org/extlink&oid=126732423&loc=SL123482106-238011

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 50
-Paragraph 6
-URI https://asc.fasb.org/extlink&oid=124431353&loc=SL124452729-227067

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section S99
-Paragraph 1B
-Subparagraph (SX 210.13-02(a)(5))
-URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442552-122756

Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(20))
-URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227

Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-URI https://asc.fasb.org/extlink&oid=124431687&loc=d3e22499-107794

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section S99
-Paragraph 1A
-Subparagraph (SX 210.13-01(a)(4)(iv))
-URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442526-122756

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section S99
-Paragraph 1A
-Subparagraph (SX 210.13-01(a)(4)(iii)(A))
-URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442526-122756

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section S99
-Paragraph 1B
-Subparagraph (SX 210.13-02(a)(4)(i))
-URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442552-122756

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section S99
-Paragraph 1A
-Subparagraph (SX 210.13-01(a)(4)(i))
-URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442526-122756

Reference 15: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 9
-URI https://asc.fasb.org/extlink&oid=124431687&loc=d3e22663-107794

Reference 16: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section S99
-Paragraph 1B
-Subparagraph (SX 210.13-02(a)(4)(iv))
-URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442552-122756

Reference 17: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section S99
-Paragraph 1A
-Subparagraph (SX 210.13-01(a)(4)(ii))
-URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442526-122756

Reference 18: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 28
-Subparagraph (f)
-URI https://asc.fasb.org/extlink&oid=123596393&loc=d3e14064-108612

Reference 19: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 3
-URI https://asc.fasb.org/extlink&oid=124431687&loc=d3e22583-107794

Reference 20: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(g)(1)(ii))
-URI https://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

Reference 21: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 60B
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126958026&loc=SL5780133-109256

Reference 22: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

Reference 23: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 8
-URI https://asc.fasb.org/extlink&oid=124431687&loc=d3e22658-107794

Reference 24: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 1A
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126968391&loc=SL7669619-108580

Reference 25: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 31
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8924-108599

Reference 26: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 11
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=124431687&loc=d3e22694-107794

Reference 27: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 11
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=124431687&loc=d3e22694-107794

Reference 28: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 7
-URI https://asc.fasb.org/extlink&oid=109222650&loc=SL51721683-107760

Reference 29: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 1B
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126968391&loc=SL7669625-108580

Reference 30: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8736-108599

Reference 31: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section S99
-Paragraph 1A
-Subparagraph (SX 210.13-01(a)(5))
-URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442526-122756

Reference 32: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section S99
-Paragraph 1B
-Subparagraph (SX 210.13-02(a)(4)(iii)(B))
-URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442552-122756

Reference 33: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section S99
-Paragraph 1B
-Subparagraph (SX 210.13-02(a)(4)(iii)(A))
-URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442552-122756

Reference 34: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 30
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8906-108599

Reference 35: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8933-108599

+ Details

- Definition

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(g)(1)(ii))
-URI https://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 852
-SubTopic 10
-Section 55
-Paragraph 10
-URI https://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 4.E)
-URI https://asc.fasb.org/extlink&oid=122038336&loc=d3e74512-122707

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(31))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(30))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 28
-Subparagraph (f)
-URI https://asc.fasb.org/extlink&oid=123596393&loc=d3e14064-108612

Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

+ Details

Long-Term Debt, Finance Leases, and Other Borrowings - Schedule of Long-term Debt (Detail) - USD ($) $ in Thousands	Dec. 31, 2022	Sep. 30, 2022
Debt Instrument [Line Items]
Gross long-term debt, including current maturities	$ 701,347	$ 615,310
Less unamortized debt issuance costs	(8,051)	(8,303)
Less notes payable warrants	(6,678)	(7,272)
Net long-term debt, including current maturities	686,618	599,735
Less current portion, net of unamortized debt issuance costs	(88,802)	(97,218)
Net long-term debt	597,816	502,517
Revolving Credit Facility, Monthly Collateralized by Underlying Equipment and Investments, Through 2022 [Member]
Debt Instrument [Line Items]
Gross long-term debt, including current maturities	41,130	15,630
Senior and Subordinated Notes Payable to Secured Parties, Due in Monthly Installments Collateralized by the Underlying Aircraft Through 2027 [Member]
Debt Instrument [Line Items]
Gross long-term debt, including current maturities	69,919	73,850
Notes Payable to Secured Parties, Due in Semi Annual Installments Collateralized by the Underlying Aircraft Through 2028 [Member]
Debt Instrument [Line Items]
Gross long-term debt, including current maturities	131,010	131,010
Notes Payable to Secured Parties, Due in Quarterly Installments Collateralized by the Underlying Aircraft Through 2028 [Member]
Debt Instrument [Line Items]
Gross long-term debt, including current maturities	102,802	106,865
Other Obligations Due to Financial Institutions, Monthly or Quarterly Collateralized by the Underlying Equipment, Due 2022 Through 2031 [Member]
Debt Instrument [Line Items]
Gross long-term debt, including current maturities	80,117	18,038
Notes Payable to Financial Institution, Due in Monthly Installments Collateralized by the Underlying Equipment, Through 2024 [Member]
Debt Instrument [Line Items]
Gross long-term debt, including current maturities	21,891	26,758
Notes Payable to Financial Institution, Due in Monthly Installments Secured by Flight Equipment, Through 2023 [Member]
Debt Instrument [Line Items]
Gross long-term debt, including current maturities	1,500	2,000
Notes Payable to Financial Institution, Quarterly, Through 2027 [Member]
Debt Instrument [Line Items]
Gross long-term debt, including current maturities	204,947	204,947
Notes Payable to Financial Institution, Due in Monthly Installments Collateralized by the Underlying Equipment, Through 2027 [Member]
Debt Instrument [Line Items]
Gross long-term debt, including current maturities	$ 48,031	$ 36,212

Concentrations of Credit Risk - Additional Information (Detail) - USD ($)	3 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Sep. 30, 2022
Concentration Risk [Line Items]
Restricted cash	$ 3,343,000		$ 3,342,000
Outstanding letters of credit to be collateralized by amounts on deposit	3,300,000
Allowance for doubtful accounts	$ 0		$ 0
Sales Revenue, Net [Member] \| American Airlines Inc. [Member] \| Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	45.00%	45.00%
Sales Revenue, Net [Member] \| United [Member] \| Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	50.00%	49.00%

Summary of Significant Accounting Policies - Schedule of Future Minimum Rental Income under Non-cancelable Operating Leases (Detail) $ in Thousands	Dec. 31, 2022 USD ($)
Operating Lease Liabilities Payments Due [Abstract]
2023 (remainder of)	$ 1,638
2024	2,184
2025	2,184
2026	2,184
2027	2,184
Thereafter	8,008
Total	$ 18,382

Income Taxes

3 Months Ended

Dec. 31, 2022

Income Tax Disclosure [Abstract]

Income Taxes

12.

Income Taxes

Our effective tax rate (ETR) from continuing operations was 9.3% for the three months ended December 31, 2022 and 22.4% for the three months ended December 31, 2021. The Company’s ETR during the three months ended December 31, 2022 decreased from the prior year tax rate, primarily as a result of certain tax differences, state taxes, and changes in the valuation allowance against federal and state net operating losses.

We maintain a valuation allowance on a portion of our federal and state net operating losses in jurisdictions with shortened carryforward periods or in jurisdictions where our operations have significantly decreased as compared to prior years in which the net operating losses were generated.

As of September 30, 2022, the Company had aggregate federal and state net operating loss carryforwards of approximately $591.4 million and $247.0 million, respectively, which expire in fiscal years 2027-2038 and 2023-2043, respectively. Approximately $6.3 million of state net operating loss carryforwards are expected to expire in the current fiscal year.

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 21
-URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32857-109319

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 11.C)
-URI https://asc.fasb.org/extlink&oid=122134291&loc=d3e330215-122817

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 17
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32809-109319

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 6.I.5.Q1)
-URI https://asc.fasb.org/extlink&oid=122134291&loc=d3e330036-122817

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 14
-URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32705-109319

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 270
-Section 50
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=6424409&loc=d3e44925-109338

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-URI https://asc.fasb.org/topic&trid=2144680

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=6424122&loc=d3e41874-109331

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(h)(2))
-URI https://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

+ Details

Long-Term Debt, Finance Leases, and Other Borrowings - Additional Information (Detail)			1 Months Ended		3 Months Ended
	Dec. 27, 2022 USD ($)	Oct. 30, 2020 USD ($) $ / shares shares	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2022 USD ($)	Sep. 30, 2022 USD ($)	Dec. 31, 2020 USD ($)	Apr. 09, 2020 $ / shares
Debt Instrument [Line Items]
Property and equipment-gross			$ 1,364,700,000		$ 1,364,700,000	$ 1,270,563,000
Long-Term Debt			686,618,000		686,618,000	$ 599,735,000
Revolving loan			$ 25,500,000		$ 25,500,000
Warrants of common stock exercise price \| $ / shares								$ 3.98
Treasury Loan [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Calculated collateral coverage ratio		1.6
Minimum collateral coverage ratio covenant			1.55
Treasury Loan [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Additional collateral coverage ratio		1.6
Loan Agreement [Member]
Debt Instrument [Line Items]
Warrants to purchase shares of common stock \| shares		4,899,497
Warrants of common stock exercise price \| $ / shares		$ 3.98
Spare Engine Facility [Member] \| Loan Agreement [Member]
Debt Instrument [Line Items]
Debt instrument, face amount				$ 35,300,000
Long term debt interest rate description					LIBOR plus 4.24%
Secured term loan facility, maximum borrowing capacity				$ 54,000,000.0
Debt instrument, maturity date				Dec. 31, 2027
Spare Engine Facility [Member] \| LIBOR [Member] \| Loan Agreement [Member]
Debt Instrument [Line Items]
Long term debt, basis spread on variable rate				4.24%
United Capacity Purchase Agreement [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Long term debt, basis spread on variable rate	3.50%
Revolving loan	$ 10,000,000.0
Covenant capping restricted payments	5,000,000.0
Revolving commitments	$ 30,700,000
Rental coverage ratio	1.00
United Capacity Purchase Agreement [Member] \| Revolving Credit Facility [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Amount required					$ 15,000,000.0
United Capacity Purchase Agreement [Member] \| Revolving Credit Facility [Member] \| SOFR [Member]
Debt Instrument [Line Items]
Long term debt, basis spread on variable rate	4.50%
United Capacity Purchase Agreement [Member] \| United [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Amount funded by company					25,500,000
Equipment Notes [Member]
Debt Instrument [Line Items]
Long-Term Debt			$ 131,000,000.0		$ 131,000,000.0
Secured Term Loan Facility [Member] \| Loan Agreement [Member]
Debt Instrument [Line Items]
Secured term loan facility, maximum borrowing capacity		$ 200,000,000.0
Debt instrument, maturity date					Oct. 30, 2025
Secured Term Loan Facility [Member] \| Loan Agreement [Member] \| Treasury Loan [Member]
Debt Instrument [Line Items]
Long term debt, basis spread on variable rate		3.50%
Secured term loan facility, amount borrowed							$ 195,000,000.0
Secured term loan facility, additional amount borrowed			0		$ 0
Debt instrument, maturity date		Oct. 30, 2025
Aircraft and Equipment [Member] \| Pledged as Collateral [Member]
Debt Instrument [Line Items]
Property and equipment-gross			$ 869,200,000		$ 869,200,000

Earnings Per Share - Calculations of Net Loss Per Common Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Earnings Per Share And Equity [Abstract]
Net loss	$ (9,090)	$ (14,274)
Basic weighted average common shares outstanding	36,378	35,963
Add: Incremental shares for:
Diluted weighted average common shares outstanding	36,378	35,963
Net loss per share attributable to common shareholders
Basic	$ (0.25)	$ (0.40)
Diluted	$ (0.25)	$ (0.40)

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 40
-Section 65
-Paragraph 1
-Subparagraph (e)(4)
-URI https://asc.fasb.org/extlink&oid=126732423&loc=SL123482106-238011

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 3
-URI https://asc.fasb.org/extlink&oid=124431687&loc=d3e22583-107794

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 11
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=124431687&loc=d3e22694-107794

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 10
-URI https://asc.fasb.org/extlink&oid=126958026&loc=d3e1448-109256

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 4
-URI https://asc.fasb.org/extlink&oid=124431687&loc=d3e22595-107794

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 11
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=124431687&loc=d3e22694-107794

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 7
-URI https://asc.fasb.org/extlink&oid=126958026&loc=d3e1337-109256

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 40
-Section 65
-Paragraph 1
-Subparagraph (f)
-URI https://asc.fasb.org/extlink&oid=126732423&loc=SL123482106-238011

Reference 9: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 55
-Paragraph 52
-URI https://asc.fasb.org/extlink&oid=128363288&loc=d3e4984-109258

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(23))
-URI https://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 55
-Paragraph 15
-URI https://asc.fasb.org/extlink&oid=128363288&loc=d3e3842-109258

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=124431687&loc=d3e22644-107794

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(25))
-URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227

Reference 15: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 2
-URI https://asc.fasb.org/extlink&oid=126958026&loc=d3e1252-109256

Reference 16: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 60B
-Subparagraph (d)
-URI https://asc.fasb.org/extlink&oid=126958026&loc=SL5780133-109256

Reference 17: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(27))
-URI https://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260

+ Details

- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 55
-Paragraph 52
-URI https://asc.fasb.org/extlink&oid=128363288&loc=d3e4984-109258

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=124431687&loc=d3e22644-107794

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 55
-Paragraph 15
-URI https://asc.fasb.org/extlink&oid=128363288&loc=d3e3842-109258

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 2
-URI https://asc.fasb.org/extlink&oid=126958026&loc=d3e1252-109256

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 11
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=124431687&loc=d3e22694-107794

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 4
-URI https://asc.fasb.org/extlink&oid=124431687&loc=d3e22595-107794

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 3
-URI https://asc.fasb.org/extlink&oid=124431687&loc=d3e22583-107794

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 60B
-Subparagraph (d)
-URI https://asc.fasb.org/extlink&oid=126958026&loc=SL5780133-109256

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 40
-Section 65
-Paragraph 1
-Subparagraph (f)
-URI https://asc.fasb.org/extlink&oid=126732423&loc=SL123482106-238011

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(27))
-URI https://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(23))
-URI https://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 11
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=124431687&loc=d3e22694-107794

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 7
-URI https://asc.fasb.org/extlink&oid=126958026&loc=d3e1337-109256

Reference 15: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 40
-Section 65
-Paragraph 1
-Subparagraph (e)(4)
-URI https://asc.fasb.org/extlink&oid=126732423&loc=SL123482106-238011

Reference 16: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(25))
-URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227

+ Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

+ Details

Share-Based Compensation and Stock Repurchases - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost related to unvested share-based compensation arrangements	$ 3,700
Unrecognized compensation cost, period for recognition	1 year 9 months 18 days
Share-based compensation expense	$ 700	$ 700
Repurchased shares, value	$ 1	$ 15
Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Repurchased shares, shares	847
Repurchased shares, value	$ 1,000
Board of Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares vesting period	1 year
Restricted Stock Units [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares vesting period	3 years
Restricted Stock Units [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares vesting period	5 years

Organization and Operations - Additional Information (Detail)		1 Months Ended	3 Months Ended				12 Months Ended	24 Months Ended
	Dec. 20, 2019 AirCraft	Aug. 31, 2022 AirCraft	Dec. 31, 2022 USD ($) DailyDeparture Engine AirCraft Employee Flighthour City State	Sep. 30, 2022 USD ($)	Mar. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Sep. 30, 2022 USD ($) AirCraft	Dec. 31, 2024 USD ($) AirCraft
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of states in which entity operates \| State			42
Number of aircrafts operated			158
Number of cities in which entity operates \| City			106
Number of daily departures \| DailyDeparture			293
Number of employees \| Employee			2,478
Net cash provided by operating activities \| $			$ (6,034,000)			$ 4,751,000
Net loss \| $			(9,090,000)			$ (14,274,000)
Intangible asset impairment \| $			3,719,000
Proceeds from sale of property \| $			$ 8,200,000
Number of spare engines to be sold \| Engine			30
Gross proceeds from sale of asset \| $			$ 80,000,000
Proceeds from sale of asset \| $			26,400,000
Revolving loan \| $			25,500,000
Reduction in loan amount \| $			5,000,000
Upfront provided for flight time out-of-pocket expense \| $			0
Short-term debt \| $			$ 88,800,000
Consideration For Amended Description			In January 2023, in consideration for entering into the Amended and Restated United CPA and providing the revolving line of credit, discussed in Note 9, the Company agreed to (i) grant United the right to designate one individual (the “United Designee”) to be appointed to the Company’s board of directors, and (ii) issue to United shares of our common stock equal to ten percent (10.0%) of the Company’s issued and outstanding shares on a fully diluted basis as of the date of such issuance (the “United Shares”). United’s board designee rights will terminate at such time as United’s equity ownership in the Company falls below five percent (5.0%).
Principal maturity payments on long-term debt due within next twelve months \| $			$ 88,802,000	$ 97,218,000			$ 97,218,000
United capacity purchase agreement termination notice period			30 days
RASPRO Aircraft Lease Agreement [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of aircraft lease terminated			15
Buyout pricing \| $			$ 25,000,000
Impact of Pilot Shortage and Attrition [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Net cash provided by operating activities \| $			6,000,000.0
Net loss \| $			$ 9,100,000
Intangible asset impairment \| $					$ 3,700,000
Captains [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Increased overall hourly pay due to pilot shortage and attrition				118.00%
New Hire First Officers [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Increased overall hourly pay due to pilot shortage and attrition				172.00%
Mesa Pilot Development Program [Member] \| Maximum [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Flight hours required to fly commercial aircraft \| Flighthour			1,500
CRJ-700 Aircraft [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of aircrafts listed for sale							18
Proceeds from sale of property \| $			$ 8,000,000.0				$ 36,800,000
Number of aircraft sold							10
Number of aircraft classified as assets held for sale			8
CRJ-700 Aircraft [Member] \| United Capacity Purchase Agreement [Member] \| United [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of aircrafts listed for sale		18
Number of aircraft sold			10
Number of aircraft to be sold			8
Aircraft lease term			9 years
Number of aircraft leased			10
CRJ-900 Aircraft [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of aircrafts listed for sale			11
CRJ-900 Aircraft [Member] \| Export Development Bank of Canada Agreement [Member] \| Scenario Forecast [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of aircrafts operated								7
Maximum liquidity provided \| $								$ 14,000,000
CRJ-900 Aircraft [Member] \| RASPRO Aircraft Lease Agreement [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of aircraft lease terminated			15
Buyout pricing \| $			$ 25,000,000
CRJ-900 Aircraft [Member] \| American Capacity Purchase Agreement [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of aircrafts operated			42
CRJ-900 Aircraft [Member] \| United Capacity Purchase Agreement [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of aircrafts operated			38
CRJ-200 Aircraft [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of aircrafts listed for sale			1
E-175 Aircraft [Member] \| United Capacity Purchase Agreement [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of aircrafts operated			60
E-175 Aircraft [Member] \| United Capacity Purchase Agreement [Member] \| United [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of aircrafts operated			42
Number of aircrafts owned			18
Lease expiration year			2028
Notice period for termination of agreement			United, subject to certain conditions, including the payment of certain costs tied to aircraft type, may terminate the agreement in its discretion, or remove E-175 aircraft from service, by giving us notice of 90 days or more
E-175 Aircraft [Member] \| United Capacity Purchase Agreement [Member] \| United [Member] \| Minimum [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Lease expiration year			2024
E-175 Aircraft [Member] \| United Capacity Purchase Agreement [Member] \| United [Member] \| Maximum [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Lease expiration year			2028
E175LL Aircraft [Member] \| United Capacity Purchase Agreement [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of aircrafts operated			20
Air crafts expiring month and year description			in 2032 and 2033
Boeing 737400F [Member] \| DHL Flight Services Agreement [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of aircrafts operated	3
Aircraft lease term	5 years
Number of aircraft leased	2
Notice period for termination of agreement			At any time after the first anniversary of the commencement date of the first aircraft placed in service with 90 days' written notice.
Aircraft option to extend agreement description			DHL has the option to extend the agreement with respect to one (1) or more aircraft for a period of one year with 90 days’ advance written notice.
Pipistrel Alpha Trainer 2 Aircraft [Member] \| Mesa Pilot Development Program [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of aircrafts purchased			29
Flight costs per hour \| $			$ 25

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2022	Sep. 30, 2022
Current assets:
Cash and cash equivalents	$ 56,077	$ 57,683
Restricted cash	3,343	3,342
Receivables, net	13,115	3,978
Expendable parts and supplies, net	25,509	26,715
Prepaid expenses and other current assets	3,953	6,616
Total current assets	101,997	98,334
Property and equipment, net	945,545	865,254
Intangible assets, net		3,842
Lease and equipment deposits	1,781	6,085
Operating lease right-of-use assets	11,896	43,090
Deferred heavy maintenance, net	10,311	9,707
Assets held for sale	73,000	73,000
Other assets	14,984	16,290
Total assets	1,159,514	1,115,602
Current liabilities:
Current portion of long-term debt and finance leases	88,802	97,218
Current portion of deferred revenue	1,204	385
Current maturities of operating leases	5,354	17,233
Accounts payable	51,257	59,386
Accrued compensation	9,097	11,255
Other accrued expenses	30,561	29,000
Total current liabilities	186,275	214,477
Noncurrent liabilities:
Long-term debt and finance leases, excluding current portion	597,816	502,517
Noncurrent operating lease liabilities	9,533	16,732
Deferred credits	2,869	3,082
Deferred income taxes	16,705	17,719
Deferred revenue, net of current portion	17,607	23,682
Other noncurrent liabilities	28,938	29,219
Total noncurrent liabilities	673,468	592,951
Total liabilities	859,743	807,428
Commitments and contingencies (Note 16)
Stockholders' equity:
Common stock of no par value and additional paid-in capital, 125,000,000 shares authorized; 36,378,550 (2023) and 36,376,897 (2022) shares issued and outstanding, 4,899,497 (2023) and 4,899,497 (2022) warrants issued and outstanding	259,864	259,177
Retained earnings	39,907	48,997
Total stockholders' equity	299,771	308,174
Total liabilities and stockholders' equity	$ 1,159,514	$ 1,115,602

Assets Held for Sale - Additional Information (Detail) $ in Thousands		3 Months Ended
	Jan. 31, 2023 USD ($) AirCraft	Mar. 31, 2023 AirCraft	Dec. 31, 2022 USD ($) AirCraft	Sep. 30, 2022 USD ($)
Long Lived Assets Held For Sale [Line Items]
Assets held for sale \| $			$ 73,000	$ 73,000
Proceeds from sale of property \| $			$ 8,200
CRJ-900 [Member]
Long Lived Assets Held For Sale [Line Items]
Number of aircraft held for sale			11
CRJ-900 [Member] \| Forecast [Member]
Long Lived Assets Held For Sale [Line Items]
Number of aircraft sold		11
CRJ 700 [Member]
Long Lived Assets Held For Sale [Line Items]
Number of aircraft held for sale			8
CRJ 700 [Member] \| Subsequent Event [Member]
Long Lived Assets Held For Sale [Line Items]
Number of aircraft sold	8
Proceeds from sale of property \| $	$ 8,000
CRJ-200 Aircraft [Member]
Long Lived Assets Held For Sale [Line Items]
Number of aircraft held for sale			1
CRJ-200 Aircraft [Member] \| Forecast [Member]
Long Lived Assets Held For Sale [Line Items]
Number of aircraft sold		1
C R J-900 C R J-700 C R J-200 Aircraft [Member]
Long Lived Assets Held For Sale [Line Items]
Assets held for sale \| $			$ 73,000

Intangible Assets - Information About Intangible Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2022	Sep. 30, 2022
Intangible Assets Net Excluding Goodwill [Abstract]
Customer relationship	$ 43,800	$ 43,800
Accumulated amortization	(38,152)	(38,029)
Impairment	$ (5,648)	(1,929)
Net carrying value		$ 3,842

Summary of Significant Accounting Policies - Schedule of Deferred Revenue Remaining Performance Obligations (Detail 1) $ in Thousands	Dec. 31, 2022 USD ($)
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Total Revenue	$ 18,811

Summary of Significant Accounting Policies - Schedule of Deferred Revenue Remaining Performance Obligations (Detail) $ in Thousands	Dec. 31, 2022 USD ($)
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Total Revenue	$ 18,811
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2023-01-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Total Revenue	$ 691
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2023-10-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Total Revenue	$ 3,214
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2024-10-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Total Revenue	$ 4,810
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2025-10-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Total Revenue	$ 4,024
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2026-10-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Total Revenue	$ 3,675
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2027-10-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Total Revenue	$ 2,397
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year

Summary of Significant Accounting Policies

3 Months Ended

Dec. 31, 2022

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

Basis of Presentation

Segment Reporting

Use of Estimates

Contract Revenue and Pass-through and Other Revenue


Periods Ending December 31,	Total Revenue
2023 (remainder of)	$	691
2024		3,214
2025		4,810
2026		4,024
2027		3,675
Thereafter		2,397
Total	$	18,811

The following table summarizes future minimum rental income under operating leases related to leased aircraft that had remaining non-cancelable lease terms as of December 31, 2022 (in thousands):


Periods Ending December 31,	Total Payments
2023 (remainder of)	$	1,638
2024		2,184
2025		2,184
2026		2,184
2027		2,184
Thereafter		8,008
Total	$	18,382

Leases

Contract Liabilities

Maintenance Expense

Assets Held for Sale

Commitments and Contingencies - Additional Information (Detail)		3 Months Ended
	Dec. 27, 2022 USD ($) Engine	Dec. 31, 2022 USD ($) Engine Lawsuit	Jul. 31, 2021 USD ($)	Feb. 28, 2021 USD ($)
Purchase Commitment Excluding Longterm Commitment [Line Items]
Number of spare engines to be sold \| Engine		30
Number of putative class action lawsuits \| Lawsuit		2
Gross proceeds from sale of asset		$ 80,000,000
Proceeds from sale of property		$ 8,200,000
Forward Purchase Contract [Member] \| Heart Aerospace Incorporated [Member] \| Maximum [Member]
Purchase Commitment Excluding Longterm Commitment [Line Items]
Purchase commitment amount			$ 1,200,000,000.0
Engine Sale Agreement [Member]
Purchase Commitment Excluding Longterm Commitment [Line Items]
Number of spare engines to be sold \| Engine	30
Gross proceeds from sale of asset	$ 80,000,000.0
Proceeds from sale of property	$ 53,600,000
CF34-8C5 or CF34-8E5 Engines [Member] \| Letter Agreement No. 13-3 [Member]
Purchase Commitment Excluding Longterm Commitment [Line Items]
Number of new spare engines to be acquired \| Engine		10
New spare engines delivery month and year description		We agreed to purchase and take delivery of ten (10) new CF34-8C5 or CF34-8E5 engines with delivery dates starting from July 1, 2021 through November 1, 2022. The total purchase commitment related to these ten (10) engines is approximately $52.2 million.
Purchase commitment amount		$ 52,200,000
Number of additional spare engines to be acquired beyond 2022 \| Engine		10
Number of new spare engines purchased \| Engine		10
eVTOL Aircraft [Member] \| Forward Purchase Contract [Member] \| Archer Aviation, Inc. [Member]
Purchase Commitment Excluding Longterm Commitment [Line Items]
Purchase commitment amount				$ 200,000,000.0

Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Operating revenues:
Contract revenue	$ 147,173	$ 147,757
Operating expenses:
Flight operations	58,320	47,598
Maintenance	48,287	58,981
Aircraft rent	4,083	9,586
General and administrative	13,988	12,578
Depreciation and amortization	15,203	21,028
Intangible asset impairment	3,719
Other operating expenses	1,126	1,972
Total operating expenses	144,726	151,743
Operating income (loss)	2,447	(3,986)
Other income (expense), net:
Interest expense	(11,276)	(7,930)
Interest income	71	51
Loss on investments, net	(1,679)	(6,462)
Other income (expense), net	417	(59)
Total other expense, net	(12,467)	(14,400)
Loss before taxes	(10,020)	(18,386)
Income tax benefit	(930)	(4,112)
Net loss and comprehensive loss	$ (9,090)	$ (14,274)
Net loss per share attributable to common shareholders
Basic	$ (0.25)	$ (0.40)
Diluted	$ (0.25)	$ (0.40)
Weighted-average common shares outstanding
Basic	36,378	35,963
Diluted	36,378	35,963
Contract Revenue
Operating revenues:
Contract revenue	$ 128,450	$ 136,894
Pass Through and Other Revenue
Operating revenues:
Contract revenue	$ 18,723	$ 10,863

Concentrations of Credit Risk

3 Months Ended

Dec. 31, 2022

Risks And Uncertainties [Abstract]

Concentrations of Credit Risk

Financial instruments that potentially expose the Company to a concentration of credit risk consist principally of cash and cash equivalents that are primarily held by financial institutions in the United States and accounts receivable. Amounts on deposit with a financial institution may at times exceed federally insured limits. We maintain our cash accounts with high credit quality financial institutions and, accordingly, minimal credit risk exists with respect to the financial institutions.

As of December 31, 2022, we had $3.3 million in restricted cash. We have an agreement with a financial institution for a letter of credit facility and to issue letters of credit for particular airport authorities, worker's compensation insurance, property and casualty insurance and other business needs as required in certain lease agreements. Pursuant to the terms of this agreement, $3.3 million of outstanding letters of credit are required to be collateralized by amounts on deposit.

Significant customers are those which represent more than 10% of our total revenue or net accounts receivable balance at each respective balance sheet date. All of our revenue for the three months ended December 31, 2022 and 2021 was derived from the American and United CPAs, DHL FSA, and from leases of our CRJ-700 aircraft to GoJet. Substantially all of our accounts receivable at December 31, 2022 and September 30, 2022 was derived from these agreements.

American accounted for approximately 45% and 45% of our total revenue for the three months ended December 31, 2022 and 2021, respectively. United accounted for approximately 50% and 49% of our total revenue for the three months ended December 31, 2022 and 2021, respectively. In December 2022, the Company entered into the AA Amendment that provides for the termination and wind-down of the American CPA by April 3, 2023. Also in December 2022, the Company entered into the Amended and Restated United CPA, which transitions the aircraft previously operated under the American CPA to be operated under the Amended and Restated United CPA as of April 2023, refer to Note 1 for further discussion regarding both amendments. A termination of the United CPA would have a material adverse effect on our business prospects, financial condition, results of operations, and cash flows.

Amounts billed under our agreements are subject to our interpretation of the applicable agreement and are subject to audit by our major partners. Periodically, our major partners dispute amounts billed and pay amounts less than the amount billed. Ultimate collection of the remaining amounts not only depends upon the Company prevailing under the applicable audit, but also upon the financial well-being of the major partner. As such, we review amounts due based on historical collection trends, the financial condition of the major partners, and current external market factors and record a reserve for amounts estimated to be uncollectible in accordance with the applicable guidance for expected credit losses. Our allowance for doubtful accounts was not material as of December 31, 2022 or September 30, 2022. If our ability to collect these receivables and the financial viability of our major partners is materially different than estimated, our estimate of the allowance for credit losses could be materially impacted.

Commitments and Contingencies

3 Months Ended

Dec. 31, 2022

Commitments And Contingencies Disclosure [Abstract]

Commitments and Contingencies

16.

Commitments and Contingencies

Engine Purchase and Sale Commitments

On February 26, 2021, the Company and General Electric Company (“GE”), acting through its GE-Aviation business unit, entered into an Amended and Restated Letter Agreement No. 13-3. We agreed to purchase and take delivery of ten (10) new CF34-8C5 or CF34-8E5 engines with delivery dates starting from July 1, 2021 through November 1, 2022. The total purchase commitment related to these ten (10) engines is approximately $52.2 million. We also have options to purchase an additional ten (10) similar engines beyond 2022. As of December 31, 2022, we have received delivery of all ten (10) purchased engines pursuant to the Amended and Restated Letter Agreement No. 13-3.

On December 27, 2022, the Company entered into an Engine Sale Agreement with United. The Engine Sale Agreement provides for the sale by the Company to United of 30 GE aircraft engines, with gross proceeds of approximately $80.0 million. The Company expects the net proceeds from this sale to be approximately $53.6 million. The closing of the sale of each engine is subject to certain customary closing deliverables, including delivery of bills of sale and delivery receipts, confirmation of engine location, termination of any existing liens, and other deliverables customary for transactions of this type.

Litigation

We are involved in various legal proceedings (including, but not limited to, insured claims) and FAA civil action proceedings which we consider routine to our business activities on an ongoing basis. If we believe that a loss arising from such matters is probable and can be reasonably estimated, we accrue the estimated liability in our consolidated financial statements. If only a range of estimated losses can be determined, we accrue an amount within the range that, in our judgment, reflects the most likely outcome; if none of the estimates within that range is a better estimate than any other amount, we accrue the low end of the range. For those proceedings in which an unfavorable outcome is reasonably possible but not probable, we have disclosed an estimate of the reasonably possible loss or range of losses or we have concluded that an estimate of the reasonably possible loss or range of losses arising directly from the proceeding (i.e., monetary damages or amounts paid in judgment or settlement) is not material. If we cannot estimate the probable or reasonably possible loss or range of losses arising from a proceeding, we have disclosed that fact. In assessing the materiality of a proceeding, we evaluate, among other factors, the amount of monetary damages claimed, as well as the potential impact of non-monetary remedies sought by plaintiffs (e.g. injunctive relief) that may require us to change our business practices in a manner that could have a material adverse impact on our business.

With respect to the matters disclosed in Item 3: “Legal Proceedings”, we believe that the ultimate outcomes of the two (2) putative class action lawsuits and other such routine legal matters are not likely to have a material adverse effect on our financial position, liquidity, or results of operations. However, legal and regulatory proceedings are inherently unpredictable and subject to significant uncertainties. If one or more matters were resolved against us in a reporting period for amounts in excess of management’s expectations, the impact on our operating results or financial condition for that reporting period could be material.

Electric Aircraft Forward Purchase Commitments

As described in Note 7, in February 2021, we entered into a forward purchase contract with Archer for a number of eVTOL aircraft. The aggregate base commitment for the eVTOL aircraft is $200.0 million, with an option to purchase additional aircraft. Our obligation to purchase the eVTOL aircraft is subject to the Company and Archer first agreeing in the future to a number of terms and conditions, which may or may not be met.

As described in Note 7, in July 2021, we entered into a forward purchase contract with Heart for a number of fully electric aircraft. The maximum aggregate base commitment for the aircraft is $1,200.0 million, with an option to purchase additional aircraft. Our obligation to purchase the aircraft is subject to the Company and Heart first agreeing in the future to a number of terms and conditions, which may or may not be met.

Other Commitments

We have certain contracts for goods and services that require us to pay a penalty, acquire inventory specific to us or purchase contract-specific equipment, as defined by each respective contract, if we terminate the contract without cause prior to its expiration date. Because these obligations are contingent on our termination of the contract without cause prior to its expiration date, no obligation would exist unless such a termination occurs.

Common Stock - Additional Information (Detail) - $ / shares	Dec. 31, 2022	Sep. 30, 2022	Apr. 09, 2020
Stockholders Equity Note [Abstract]
Warrants of common stock exercise price			$ 3.98
Common stock, warrants issued	4,899,497	4,899,497
Common stock, warrants outstanding	4,899,497	4,899,497

Document and Entity Information - shares	3 Months Ended
Document and Entity Information - shares	Dec. 31, 2022	Feb. 07, 2023
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Dec. 31, 2022
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q1
Trading Symbol	MESA
Title of 12(b) Security	Common Stock, no par value
Security Exchange Name	NASDAQ
Entity Incorporation, State or Country Code	NV
Entity File Number	001-38626
Entity Tax Identification Number	85-0302351
Entity Address, Address Line One	410 North 44th Street
Entity Address, Address Line Two	Suite 700
Entity Address, City or Town	Phoenix
Entity Address, Postal Zip Code	85008
City Area Code	602
Local Phone Number	685-4000
Entity Address, State or Province	AZ
Entity Registrant Name	MESA AIR GROUP, INC.
Entity Central Index Key	0000810332
Current Fiscal Year End Date	--09-30
Entity Filer Category	Accelerated Filer
Entity Shell Company	false
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Document Quarterly Report	true
Document Transition Report	false
Entity Common Stock, Shares Outstanding		40,420,611

Earnings Per Share

3 Months Ended

Dec. 31, 2022

Earnings Per Share [Abstract]

Earnings Per Share

10.

Earnings Per Share

Calculations of net loss per common share attributable to Mesa Air Group were as follows (in thousands, except per share data):


	Three Months Ended December 31,
	2022			2021
Net loss attributable to Mesa Air Group	$	(9,090	)	$	(14,274	)
Basic weighted average common shares outstanding		36,378			35,963
Add: Incremental shares for:
Dilutive effect of warrants		—			—
Dilutive effect of restricted stock		—			—
Diluted weighted average common shares outstanding		36,378			35,963
Net loss per common share attributable to Mesa Air Group:
Basic	$	(0.25	)	$	(0.40	)
Diluted	$	(0.25	)	$	(0.40	)

Basic income or loss per common share is computed by dividing net income or loss attributable to Mesa Air Group by the weighted average number of common shares outstanding during the period.

The number of incremental shares from the assumed issuance of shares relating to restricted stock and exercise of warrants is calculated by applying the treasury stock method. Share-based awards and warrants whose impact is anti-dilutive under the treasury stock method are excluded from the diluted net income or loss per share calculation. In loss periods, these incremental shares are excluded from the calculation of diluted loss per share, as the inclusion of unvested restricted stock and warrants would have an anti-dilutive effect.

The following number of weighted-average potentially dilutive shares were excluded from the calculation of diluted net loss per share because the effect of including such potentially dilutive shares would have been anti-dilutive:


	Three Months Ended December 31,
	2022		2021
Warrants		—		2,215
Restricted stock		—		341
		—		2,556

Summary of Significant Accounting Policies (Tables)

3 Months Ended

Dec. 31, 2022

Accounting Policies [Abstract]

Schedule of Deferred Revenue Remaining Performance Obligations


Periods Ending December 31,	Total Revenue
2023 (remainder of)	$	691
2024		3,214
2025		4,810
2026		4,024
2027		3,675
Thereafter		2,397
Total	$	18,811

Schedule of Future Minimum Rental Income under Non-cancelable Operating Leases


Periods Ending December 31,	Total Payments
2023 (remainder of)	$	1,638
2024		2,184
2025		2,184
2026		2,184
2027		2,184
Thereafter		8,008
Total	$	18,382

Leases - Components of Operating Lease Costs (Detail) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Leases [Abstract]
Operating lease costs	$ 4,699	$ 9,480
Variable and short-term lease costs	889	1,735
Interest expense on finance lease liabilities	274	100
Amortization expense of finance lease assets	1,046	533
Total lease costs	$ 6,907	$ 11,848

Leases (Tables)

3 Months Ended

Dec. 31, 2022

Leases [Abstract]

Components of Operating Lease Costs

The components of our operating lease costs were as follows (in thousands):


	Three Months Ended December 31,
	2022		2021
Operating lease costs	$	4,699	$	9,480
Variable and short-term lease costs		889		1,735
Interest expense on finance lease liabilities		274		100
Amortization expense of finance lease assets		1,046		533
Total lease costs	$	6,907	$	11,848

Organization and Operations

3 Months Ended

Dec. 31, 2022

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Organization and Operations

About Mesa Air Group, Inc.

Headquartered in Phoenix, Arizona, Mesa Air Group, Inc. ("Mesa" or the "Company") is the holding company of Mesa Airlines, a regional air carrier providing scheduled passenger service to 106 cities in 42 states, the District of Columbia, the Bahamas, Cuba, and Mexico as well as cargo services out of Cincinnati/Northern Kentucky International Airport. As of December 31, 2022, Mesa operated a fleet of 158 aircraft with approximately 293 daily departures and 2,478 employees. Mesa’s fleet were conducted under the Company’s Capacity Purchase Agreements (“CPAs”) and Flight Services Agreement (“FSA”), leased to a third party, held for sale or maintained as operational spares. Mesa operates all of its flights as either American Eagle, United Express, or DHL Express flights pursuant to the terms of CPAs entered into with American Airlines, Inc. (“American”) and United Airlines, Inc. (“United”) and FSA with DHL Network Operations (USA), Inc. (“DHL”) (each, our “major partner”). All of the Company’s consolidated contract revenues for the three months ended December 31, 2022 and 2021 were derived from operations associated with these two (2) CPAs, FSA, and leases of aircraft to a third party.

The CPAs between us and our major partners involve a revenue-guarantee arrangement whereby the major partners pay fixed-fees for each aircraft under contract, departure, flight hour (measured from takeoff to landing, excluding taxi time) or block hour (measured from takeoff to landing, including taxi time), and reimbursement of certain direct operating expenses in exchange for providing flight services. The major partners also pay certain expenses directly to suppliers, such as fuel, ground operations and landing fees. Under the terms of these CPAs, the major partners control route selection, pricing, and seat inventories, reducing our exposure to fluctuations in passenger traffic, fare levels, and fuel prices. Under our FSA with DHL, we receive a fee per block hour with a minimum block hour guarantee in exchange for providing cargo flight services. Ground support expenses including fueling and airport fees are paid directly by DHL.

Impact of Pilot Shortage and Attrition

During our three months ended December 31, 2022 and fiscal year ended September 30, 2022, the severity of the pilot shortage, elevated pilot attrition, and increasing costs associated with pilot wages adversely impacted our financial results, cash flows, financial position, and other key financial ratios. One of the primary factors contributing to the pilot shortage and attrition is the demand for pilots at major carriers, which are hiring at an accelerated rate. These airlines now seek to increase their capacity to meet the growing demand for air travel as the global pandemic has moderated. A primary source of pilots for the major U.S. passenger and cargo carriers are the U.S. regional airlines.

As a result of pilot shortage and attrition, we produced less block hours to generate revenues and incurred penalties for operational shortfalls under our CPAs. During the three months ended December 31, 2022, these challenges resulted in a negative impact on the Company’s financial results highlighted by cash flows used in operations of $6.0 million and net loss of $9.1 million including a non-cash impairment charge related to the Company’s American intangible asset of $3.7 million. These conditions and events raised financial concerns about our ability to continue to fund our operations and meet debt obligation in the next twelve months.

To address the events that gave rise to such concerns, management developed and implemented the following material changes to its business designed to ensure the Company could continue to fund its operations and meet its debt obligations over the next twelve months. In addition to successfully implementing these effective measures, the Company expects to develop and implement additional measures aimed at addressing periods beyond the next twelve months.

•

During the fourth quarter 2022, the Company reached an agreement with ALPA which increased overall pilot hourly pay by nearly 118% for captains and 172% for new-hire first officers. As a result of this agreement, we have experienced reduced attrition rates and attracted new pilots.

•

The Company and American have agreed to terminate and complete a wind-down of the American CPA. This will ultimately eliminate financial penalties incurred under the American CPA. In December 2022, we entered into Amendment No.11 to our American CPA that includes, among other things, disclosure regarding the wind-down of our operations with American and the termination of the American CPA.

•

In December 2022, we entered into the Third Amended and Restated Capacity Purchase Agreement with United which amended and restated the existing United CPA. This agreement increases block hour revenues to cover increased wages agreed to with ALPA and adds CRJ 900 aircraft currently operating under the American CPA.

•

We entered into an agreement with United to sell 18 CRJ-700 aircraft during the fiscal year ended September 30, 2022, of which ten (10) were sold. The approximate net proceeds from the sale in the prior period was $36.8 million after retirement of debt. The sale of the remaining eight (8) aircraft that are classified as assets held for sale at December 31, 2022, as discussed in Note 6, closed during January 2023. The approximate net proceeds from the sale after retirement of debt is $8.0 million.

•

We entered into an agreement with a third party to sell 11 of our CRJ-900 aircraft and one (1) CRJ-200 aircraft to raise capital and retire debt, as discussed in Note 6. The approximate net proceeds of the sale are expected to be $8.2 million after retirement of debt.

•

We entered into an agreement to sell 30 spare engines to United to raise capital and retire debt. The approximate gross proceeds from the sale are expected to be $80 million and will retire debt of $26.4 million. See Note 16 for a discussion of the engine sale agreement transaction and closing deliverables.

•

We established and drew upon a new line of credit with United totaling $25.5 million. See Note 9 for a discussion of the line of credit and amount drawn.

•

We entered into an agreement with Export Development Bank of Canada (EDC), reducing debt and interest payments on seven CRJ-900 NextGen aircraft for the period of January 2023 through December 2024, providing up to $14 million of liquidity. Additionally, the junior noteholder, MHIRJ, agreed to reduce its loan amount by approximately $5 million.

•

We entered into an agreement with RASPRO Trust, reducing the buyout pricing on all 15 CRJ-900 aircraft at lease termination by a total of $25 million.

•

We established the Mesa Pilot Development Program (the "MPD Program") to increase the pilot supply to Mesa. We have entered into an agreement to purchase up to 29 state-of-the-art Pipistrel Alpha Trainer 2 aircraft. This new fleet will be the backbone of our MPD Program to help commercial pilots accelerate their accumulation of flight hours to reach the minimum flight hours required by FAA and then be hired by Mesa. As part of the program, pilots will be provided with the opportunity to accumulate up to 1,500 flight hours required to fly a commercial aircraft at Mesa Airlines. Flights costs of $25 per hour, per pilot, will be fully financed by us with zero interest, providing no upfront out-of-pocket expense for flight time while the candidate is accruing the required hours to earn their ATP certificate.

•

We added flight training simulators and flight training instructors to expand our training capacity to backfill pilots lost to attrition.

•

We expanded the United Aviate program participation to include all pilots flying for Mesa. Previously, pilots had to fly under the United Express contract for a minimum of two (2) years to qualify for the flow through to United Airlines. Now, all pilots regardless of contract, are eligible to flow through to United Airlines enhancing Mesa's ability to attract and retain pilots.

•

We have delayed and/or deferred major spending on aircraft and engine maintenance to match the current and projected level of flight activity.

The plans and initiatives outlined above have effectively alleviated pressure on financial performance. While we continue to implement and monitor our plans and initiatives, there is no guarantee that these will continue to be effective and achieve their desired objectives.

As of December 31, 2022, the Company has $88.8 million of short-term debt due within the next twelve months. We plan to meet these obligations with our cash on hand, ongoing cashflows from our operations, as well as the liquidity we have achieved as outlined above.

American Capacity Purchase Agreement

As of December 31, 2022, the Company operated 42 CRJ-900 aircraft under an Amended and Restated Capacity Purchase Agreement with American dated November 19, 2020 (as amended, the “American CPA”). In exchange for providing passenger flight services, we receive a fixed monthly minimum amount per aircraft under contract plus certain additional amounts based upon the number of flights and block hours flown during each month. In addition, we may also receive incentives or incur penalties based upon our operational performance, including controllable on-time departure (“CD0”) and controllable flight completion factor (“CCF”) percentages. American also reimburses us for certain costs on an actual basis, including passenger liability and hull insurance and aircraft property taxes. Other expenses, including fuel and certain landing fees, are directly paid to suppliers by American. In addition, American also provides, at no cost to us, certain ground handling and customer service functions as well as airport-related facilities and gates at American hubs and cities where we operate.

In December 2022, we entered into Amendment No. 11 (the “AA Amendment”) to the American CPA. The AA Amendment provides for the termination and wind-down of the American CPA by April 3, 2023 (the “Wind-down Period”), at which time all Covered Aircraft (as defined in the American CPA) will be removed from the American CPA. In March 2023, we will begin to transition aircraft operated under the American CPA to the United CPA. The American CPA was previously set to expire by its terms on December 31, 2025.

Under the terms of the AA Amendment, during the Wind-down Period (i) we will continue to receive a fixed minimum monthly amount per aircraft covered by the American CPA, plus additional amounts based on the number of flights and block hours flown during each month, subject to adjustment based on the Company’s controllable completion rate and certain other factors, and (ii) American has agreed not to exercise certain termination or withdrawal rights under the American CPA if we fail to meet certain operational performance targets for the three (3) consecutive month period ending January 31, 2023.

Provided we comply with the terms of the American CPA during the Wind-down Period and no Material Breach (as defined in the American CPA) has occurred, American has also agreed to waive Mesa’s failure to meet certain past operational performance targets and other requirements, which triggered termination and withdrawal rights for American pursuant to the terms of American CPA. Failure to meet CCF targets in any given month during the Wind-down Period will result in a penalty for each performance metric that falls below an allotted threshold.

The AA Amendment provides for liquidated damages (the “Liquidated Damages Claim”) payable to American in the event of a Material Breach (as defined in the American CPA) of the American CPA or a repudiation by us of our obligations under the American CPA.

So long as we have not caused any Material Breaches during the Wind-Down Period, then immediately upon the expiration thereof, the parties have agreed to execute a written mutual release of all claims and acknowledgment that no Material Breaches have occurred under the American CPA (including, without limitation, any Liquidated Damages Claim).

United Capacity Purchase Agreement

During the quarter ended December 31, 2022, we operated 60 E-175 and 20 E-175LL aircraft under our Second Amended and Restated Capacity Purchase Agreement with United dated November 4, 2020 (as amended, the “United CPA” or the "Second Amended and Restated Capacity Purchase Agreement"). Under the United CPA, United owns 42 of the 60 E-175 aircraft and all of the E-175LL aircraft and leases them to us at nominal amounts. The E-175 aircraft owned by United and leased to us have terms expiring between 2024 and 2028, and the 18 E-175 aircraft owned by us have terms expiring in 2028. The E-175LL aircraft have terms expiring in 2032 and 2033.

In exchange for providing passenger flight services, we receive a fixed monthly minimum amount per aircraft under contract plus certain additional amounts based upon the number of flights and block hours flown and the results of passenger satisfaction surveys. United reimburses us for certain costs on an actual basis, including property tax per aircraft and passenger liability insurance. United also reimburses us on a pass-through basis for all costs related to heavy airframe and engine maintenance, landing gear, auxiliary power units ("APUs"), and component maintenance for the E-175 aircraft owned by United. Other expenses, including fuel and certain landing fees, are directly paid to suppliers by United.

Pursuant to the United CPA, we agreed to lease our CRJ-700 aircraft to another United Express service provider for a term of nine (9) years. We ceased operating our CRJ-700 fleet in February 2021 in connection with the transfer of those aircraft into a lease agreement, and as of December 31, 2022, we have leased 10 CRJ-700 aircraft. During August of 2022, we committed to a formal plan to sell 18 CRJ-700 aircraft. As of December 31, 2022, we sold 10 of the 18 CRJ-700 aircraft. See Note 6 for further discussion of the eight (8) remaining CRJ-700 aircraft classified as held for sale.

Our United CPA is subject to termination prior to its expiration, including under the following circumstances:

•

If certain operational performance factors fall below a specified percentage for a specified time, subject to notice under certain circumstances;

•

If we fail to perform the material covenants, agreements, terms or conditions of our United CPA or similar agreements with United, subject to 30 days' notice and cure rights;

•

If either United or we become insolvent, file bankruptcy, or fail to pay debts when due, the non-defaulting party may terminate the agreement;

•

If we merge with, or if control of us is acquired by another air carrier or a corporation directly or indirectly owning or controlling another air carrier;

•

United, subject to certain conditions, including the payment of certain costs tied to aircraft type, may terminate the agreement in its discretion, or remove E-175 aircraft from service, by giving us notice of 90 days or more; and

•

If United elects to terminate our United CPA in its entirety or permanently remove aircraft from service, we are permitted to return any of the affected E-175 aircraft leased from United at no cost to us.

On December 27, 2022, we entered into the Third Amended and Restated Capacity Purchase Agreement with United (as amended and restated, the “Amended and Restated United CPA”), which amends and restates the Second Amended and Restated Capacity Purchase Agreement. The Amended and Restated United CPA provides, among other things, for the following amended terms:

•

The addition of up to 38 CRJ-900 aircraft to be operated by the Company on behalf of United under the Amended and Restated United CPA, dependent on the number of E-175 aircraft the Company is operating;

•

An increase in rates to cover the Company’s pilot pay increases instituted in September 2022, effective through September 2025;

•

United to be responsible for all costs associated with converting the CRJ-900 aircraft for operation in United’s network;

•

Terms providing that United may remove the CRJ-900 aircraft from the scope of the United CPA, subject to certain notice and other requirements;

•

United’s existing utilization waiver for the Company’s operation of E175LL Covered Aircraft (as defined in the United CPA) to be extended to December 31, 2023;

•

The extension of existing monthly operational performance incentives; and

•

An agreement by the Company to not enter into new regional air carrier service agreements, excluding the Company’s existing agreement with DHL, and provided that this restriction shall not apply from and after the earlier to occur of (i) January 1, 2026 and (ii) the Company's satisfaction of certain Performance Milestones (as defined in the Amended and Restated United CPA).

In January 2023, in consideration for entering into the Amended and Restated United CPA and providing the revolving line of credit, discussed in Note 9, the Company agreed to (i) grant United the right to designate one individual (the “United Designee”) to be appointed to the Company’s board of directors, and (ii) issue to United shares of our common stock equal to ten percent (10.0%) of the Company’s issued and outstanding shares on a fully diluted basis as of the date of such issuance (the “United Shares”). United’s board designee rights will terminate at such time as United’s equity ownership in the Company falls below five percent (5.0%).

United was also granted pre-emptive rights relating to the issuance of any equity securities by the Company and certain registration rights, set fourth in a definitive registration rights agreement with United, granting United customary demand registration rights in respect of publicly registered offerings of the Company, subject to usual and customary exceptions and limitations. See also Note 17 for a discussion regarding the amendment to the Company's bylaws as it relates to the Amended and Restated United CPA.

DHL Flight Services Agreement

On December 20, 2019, we entered into a Flight Services Agreement with DHL (the “DHL FSA”). Under the terms of the DHL FSA, we operate three (3) Boeing 737-400F aircraft to provide cargo air transportation services as of December 31, 2022. In exchange for providing cargo flight services, we receive a fee per block hour with a minimum block hour

guarantee. We are eligible for a monthly performance bonus or subject to a monthly penalty based on timeliness and completion performance. Ground support expenses including fueling and airport fees are paid directly by DHL.

Under our DHL FSA, DHL leases two (2) Boeing 737-400F aircraft and subleases them to us at nominal amounts. DHL reimburses us on a pass-through basis for all costs related to heavy maintenance including C-checks, off-wing engine maintenance and overhauls including life limited parts (“LLPs”), landing gear overhauls and LLPs, thrust reverser overhauls, and APU overhauls and LLPs. Certain items such as fuel, de-icing fluids, landing fees, aircraft ground handling fees, en-route navigation fees, and custom fees are paid directly to suppliers by DHL or otherwise reimbursed if incurred by us. The third Boeing 737-400F aircraft is leased to us as an operating lease by a third party.

The DHL FSA expires five (5) years from the commencement date of the first aircraft placed into service, which was in October 2020. DHL has the option to extend the agreement with respect to one (1) or more aircraft for a period of one year with 90 days’ advance written notice.

Our DHL FSA is subject to the following termination rights prior to its expiration:

•

If either party fails to comply with the obligations, warranties, representations, or undertakings under the DHL FSA, subject to certain notice and cure rights;

•

If either party is declared bankrupt or insolvent;

•

If we are unable to legally operate the aircraft under the DHL FSA for a specified number of days;

•

At any time after the first anniversary of the commencement date of the first aircraft placed in service with 90 days' written notice.

•

If we fail to comply with performance standards for three (3) consecutive measurement periods.

•

If we are subject to a labor incident that materially and adversely affects our ability to perform services under the DHL FSA for a specified number of days;

•

Upon a change in control or ownership of the Company; and

•

DHL may terminate the agreement for a specific aircraft if it is subject to a total loss and the Company does not provide alternate services at our expense, or if the aircraft becomes unavailable for more than 30 days due to unscheduled maintenance.

Share-Based Compensation and Stock Repurchases

3 Months Ended

Dec. 31, 2022

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Share-Based Compensation and Stock Repurchases

13.

Share-Based Compensation and Stock Repurchases

Restricted Stock

We grant restricted stock units (“RSUs”) as part of our long-term incentive compensation to employees and non-employee members of the Board of Directors. RSUs generally vest over a period of 3 to 5 years for employees and one year for members of the Board of Directors. The restricted common stock underlying RSUs are not deemed issued or outstanding upon grant, and do not carry any voting rights.

The restricted share activity for the three months ended December 31, 2022 is summarized as follows:


				Weighted-
				Average
	Number			Grant Date
	of Shares			Fair Value
Restricted shares unvested at September 30, 2022		1,172,493		$	4.43
Granted		—		$	—
Vested		(2,500	)	$	1.37
Forfeited		—		$	—
Restricted shares unvested at December 31, 2022		1,169,993		$	4.44

As of December 31, 2022, there was $3.7 million of total unrecognized compensation cost related to unvested share-based compensation arrangements, which is expected to be recognized over a weighted-average period of 1.8 years.

Compensation cost for share-based awards is recognized on a straight-line basis over the vesting period. Share-based compensation expense for the three months ended December 31, 2022 and 2021 was $0.7 million and $0.7 million, respectively.

We repurchased 847 shares of our common stock for $1.0 thousand to cover the income tax obligation on vested employee equity awards during the three months ended December 31, 2022.

Balance Sheet Information - Additional Information (Detail) - USD ($)	1 Months Ended		3 Months Ended
	Sep. 30, 2021	Jul. 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Feb. 28, 2022	Feb. 28, 2021
Condensed Balance Sheet Statements Captions [Line Items]
Depreciation expense			$ 14,400,000	$ 20,500,000
Estimated initial equity warrant asset value						$ 16,400,000
Estimated initial warrant asset value					$ 3,200,000
Net losses on investments in equity securities			1,700,000	6,500,000
Aggregate carrying amount of investments in equity securities			13,400,000
Investments without readily determinable fair value			9,000,000.0
Heart Aerospace Incorporated [Member] \| Forward Purchase Contract [Member] \| Preferred Stock [Member]
Condensed Balance Sheet Statements Captions [Line Items]
Purchase of preferred stock		$ 5,000,000.0
Initial investment in preferred stock measured at cost		$ 5,000,000.0
Class A [Member] \| Archer Aviation, Inc. [Member]
Condensed Balance Sheet Statements Captions [Line Items]
Stock issued during period, Shares	500,000
Stock issued during period, Value	$ 5,000,000.0
Total grant date value, Additional warrant to purchase shares	$ 5,600,000
CRJ-900 [Member]
Condensed Balance Sheet Statements Captions [Line Items]
Impairment of intangible asset			$ 3,700,000
Long-lived Assets [Member] \| CRJ-900 [Member]
Condensed Balance Sheet Statements Captions [Line Items]
Asset impairment				$ 0

Common Stock

3 Months Ended

Dec. 31, 2022

Stockholders Equity Note [Abstract]

Common Stock

11.

Common Stock

As discussed in Note 9, we issued warrants to the U.S. Treasury to purchase shares of our common stock, no par value, at an exercise price of $3.98 per share. The exercise price and number of shares issuable under the warrants are subject to adjustment as a result of anti-dilution provisions contained in the warrants for certain stock issuances, dividends, and other corporate actions. The warrants expire on the fifth anniversary of the date of issuance and are exercisable either through net share settlement or net cash settlement, at our option. The warrants were accounted for within equity at a grant date fair value determined under the Black-Scholes option pricing model. As of December 31, 2022, 4,899,497 warrants were issued and outstanding.

We have not historically paid dividends on shares of our common stock. Additionally, the Treasury Loan and our aircraft lease facility with RASPRO Trust 2005, a pass-through trust, contain restrictions that limit our ability to or prohibit us from paying dividends to holders of our common stock.

- Definition

The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-URI https://asc.fasb.org/topic&trid=2208762

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496158-112644

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 13
-URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496158-112644

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 14
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496171-112644

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 14
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496171-112644

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI https://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 18
-Subparagraph (d)
-URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496189-112644

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (g)
-URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496158-112644

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 18
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496189-112644

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (h)
-URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496158-112644

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 14
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496171-112644

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 18
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496189-112644

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 16
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496180-112644

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (i)
-URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496158-112644

Reference 15: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(e)(1))
-URI https://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

Reference 16: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 40
-Section 50
-Paragraph 6
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126731327&loc=SL126733271-114008

+ Details

Balance Sheet Information - Summary of Certain Significant Amounts Included in Condensed Consolidated Balance Sheet (Detail) - USD ($) $ in Thousands	Dec. 31, 2022	Sep. 30, 2022
Expendable parts and supplies, net:
Expendable parts and supplies	$ 32,013	$ 31,913
Less: obsolescence and other	(6,504)	(5,198)
Expendable parts and supplies, net	25,509	26,715
Prepaid expenses and other current assets:
Prepaid aviation insurance	1,026	2,618
Prepaid vendors	906	1,310
Prepaid other insurance	798	1,268
Lease incentives	143	352
Prepaid fuel and other	1,080	1,068
Prepaid expenses and other current assets	3,953	6,616
Property and equipment, net:
Property and equipment-gross	1,364,700	1,270,563
Less: accumulated depreciation	(419,155)	(405,309)
Property and equipment-net	945,545	865,254
Other assets:
Investments in equity securities	13,408	15,178
Lease incentives	1,061	1,097
Other	515	15
Other assets	14,984	16,290
Other accrued expenses:
Accrued property taxes	6,066	5,866
Accrued interest	5,016	2,882
Accrued vacation	7,768	4,746
Accrued lodging	3,529	3,795
Accrued maintenance	2,154	1,453
Accrued liability on government payroll program		2,967
Accrued simulator costs	149	1,045
Accrued employee benefits	1,097	1,679
Accrued fleet operating expense	1,232	1,606
Other	3,550	2,961
Other accrued expenses	30,561	29,000
Other noncurrent liabilities:
Warrant liabilities	25,225	25,225
Lease incentive obligations	1,050	1,050
Long-term employee benefits	843	1,123
Other	1,820	1,821
Other noncurrent liabilities	28,938	29,219
Aircraft and Other Flight Equipment [Member]
Property and equipment, net:
Property and equipment-gross	1,354,137	1,260,143
Other Machinery and Equipment [Member]
Property and equipment, net:
Property and equipment-gross	5,709	5,577
Leasehold Improvements [Member]
Property and equipment, net:
Property and equipment-gross	2,776	2,776
Vehicles [Member]
Property and equipment, net:
Property and equipment-gross	1,003	992
Building [Member]
Property and equipment, net:
Property and equipment-gross	777	777
Furniture and Fixtures [Member]
Property and equipment, net:
Property and equipment-gross	$ 298	$ 298

Earnings Per Share (Tables)

3 Months Ended

Dec. 31, 2022

Earnings Per Share [Abstract]

Calculations of Net Loss Per Common Share

Calculations of net loss per common share attributable to Mesa Air Group were as follows (in thousands, except per share data):


	Three Months Ended December 31,
	2022			2021
Net loss attributable to Mesa Air Group	$	(9,090	)	$	(14,274	)
Basic weighted average common shares outstanding		36,378			35,963
Add: Incremental shares for:
Dilutive effect of warrants		—			—
Dilutive effect of restricted stock		—			—
Diluted weighted average common shares outstanding		36,378			35,963
Net loss per common share attributable to Mesa Air Group:
Basic	$	(0.25	)	$	(0.40	)
Diluted	$	(0.25	)	$	(0.40	)

Number of Weighted-Average Potentially Dilutive Shares Excluded from Calculation of Diluted Net Loss Per Share


	Three Months Ended December 31,
	2022		2021
Warrants		—		2,215
Restricted stock		—		341
		—		2,556

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Cash flows from operating activities:
Net loss	$ (9,090)	$ (14,274)
Adjustments to reconcile net loss to net cash flows provided by operating activities:
Depreciation and amortization	15,203	21,028
Stock compensation expense	688	716
Loss on investments, net	1,679	6,462
Deferred income taxes	(1,014)	(4,224)
Amortization of deferred credits	(213)	(213)
Amortization of debt discount and issuance costs and accretion of interest into long-term debt	1,379	3,199
Intangible asset impairment	3,719
Other	55	243
Changes in assets and liabilities:
Receivables	(9,137)	248
Expendable parts and supplies	1,150	(978)
Prepaid expenses and other operating assets and liabilities	2,290	2,094
Accounts payable	(7,008)	174
Deferred revenue	(5,256)	(4,184)
Accrued expenses and other liabilities	(656)	(4,868)
Operating lease right-of-use assets and liabilities	177	(672)
Net cash provided by (used in) operating activities	(6,034)	4,751
Cash flows from investing activities:
Capital expenditures	(16,740)	(19,775)
Investments in equity securities		(200)
Refund (payment) of equipment and other deposits	131	(6,954)
Net cash used in investing activities	(16,609)	(26,929)
Cash flows from financing activities:
Proceeds from long-term debt	39,000	30,811
Principal payments on long-term debt and finance leases	(17,544)	(24,510)
Payments of debt and warrant issuance costs	(417)	(2,293)
Repurchase of stock	(1)	(15)
Net cash provided by financing activities	21,038	3,993
Net change in cash, cash equivalents and restricted cash	(1,605)	(18,185)
Cash, cash equivalents and restricted cash at beginning of period	61,025	123,867
Cash, cash equivalents and restricted cash at end of period	59,420	105,682
Supplemental cash flow information
Cash paid for interest	7,763	2,815
Operating lease payments in operating cash flows	4,679	10,152
Supplemental non-cash operating activities
Right-of-use assets obtained in exchange for lease liabilities	236	4,190
Supplemental non-cash financing activities
Finance lease obtained in exchange for lease liability	$ 76,185
Investments in warrants to purchase common stock		100
Accrued capital expenditures		$ 1,722

Subsequent Events - Additional Information (Detail) - $ / shares		3 Months Ended
	Jan. 13, 2023	Dec. 31, 2022	Sep. 30, 2022
Subsequent Event [Line Items]
Common stock, shares issued		36,378,550	36,376,897
Common stock, no par value		$ 0	$ 0
United Capacity Purchase Agreement [Member]
Subsequent Event [Line Items]
Amended and restated bylaws descriptions		On January 13, 2023, the Company’s Board of Directors approved a resolution to amend the Company’s Amended and Restated Bylaws (the “Bylaws”) in connection with the Company’s entry into the Amended and Restated United CPA, see Note 1, which provides United with the right to designate one (1) representative to be a member of the Board, provided that United holds at least five percent (5%) of the issued and outstanding shares of capital stock of the Company, and provided that such United Designee shall be subject to the reasonable approval of the Board. Until the earlier of January 1, 2026, or the Company’s entry into a definitive binding agreement for the performance of regional airline services with a major air carrier other than United, the Board shall not take, or make any recommendation to the stockholders of the Company
Subsequent Event [Member] \| United Capacity Purchase Agreement [Member] \| United [Member]
Subsequent Event [Line Items]
Common stock, shares issued	4,042,061
Common stock, no par value	$ 0
Common stock issued equivalent percentage of issued and outstanding capital stock	10.00%

Fair Value Measurements - Carrying Value and Estimated Fair Value of Long-term Debt, Including Current Maturities (Detail) - USD ($) $ in Thousands	Dec. 31, 2022	Sep. 30, 2022
Fair Value Disclosures [Abstract]
Long-term debt and finance leases, including current maturities, carrying value	$ 701,347	$ 615,310
Long-term debt and finance leases, including current maturities, fair value	$ 635,600	$ 541,700