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Amount of fees associated with providing collateral for the debt instrument.

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Organization and Operations - Additional Information (Detail) $ in Thousands								3 Months Ended		12 Months Ended
	Oct. 24, 2025 USD ($)	Apr. 04, 2025 USD ($) NonEmployeeDirector	Mar. 18, 2025	Jan. 01, 2025 USD ($) AirCraft	Dec. 31, 2024 USD ($) DailyDeparture State AirCraft	Jan. 19, 2024 AirCraft	Dec. 20, 2019 AirCraft	Dec. 31, 2024 USD ($) DailyDeparture AirCraft State City	Dec. 31, 2023 USD ($)	Sep. 30, 2024 USD ($) AirCraft	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Nov. 20, 2025	Nov. 20, 2025 Airframes	Nov. 20, 2025 Engine
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of states in which entity operates \| State					32			32
Number of aircrafts operated \| AirCraft								60
Number of cities in which entity operates \| City								76
Number of daily departures \| DailyDeparture					228			228
Net loss								$ (111,944)	$ (57,850)	$ (91,015)	$ (120,116)	$ (182,678)
impairment expense								4,900	40,400	73,700	50,600	62,100
Loss on sale of assets								46,691	386	682	(7,162)	(4,723)
Long-term debt					$ 143,300			143,300
Debt outstanding					230,608			$ 230,608		315,210	538,274
United capacity purchase agreement termination notice period								30 days
Purcahse of aircraft								$ 2,065	$ 6,884	20,313	36,641	$ 40,814
Outstanding principal amount					227,061			227,061		$ 310,271	$ 528,278
Treasury Loan [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Debt outstanding					112,100			112,100
Subsequent Event [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Gross proceeds from sale of asset		$ 9,200
United Revolving Credit Facility [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Revolving loan					9,000			9,000
UST Loan [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Debt outstanding					$ 112,100			$ 112,100
Debt instrument, maturity date								Oct. 30, 2025
Amendment to Loan and Guarantee Agreement [Member] \| Subsequent Event [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Debt instrument, maturity date	Nov. 28, 2025
Interest rate under the Loan Agreement	0.00%
Principal amount of the Obligation	$ 12,300
Amount deposited in collateral account	31,900
Non-refundable advisory fee	$ 3,500
United Capacity Purchase Agreement [Member] \| Subsequent Event [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Reimbursement of transition expenses				$ 14,000
Maximum [Member] \| United Capacity Purchase Agreement [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of aircrafts operated \| AirCraft								60
Minimum [Member] \| UST Loan [Member] \| Subsequent Event [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Minimum collateral coverage ratio			0.91
Aircraft Purchase Agreement [Member] \| UST Loan [Member] \| Subsequent Event [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Gross proceeds from sale of asset				67,000
Repayment of loan				$ 62,400
Merger Agreement with Republic Airways Holdings Inc. [Member] \| Subsequent Event [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of non-employee directors \| NonEmployeeDirector		7
Percenatge of interest upon effectiveness of the Merger		12.00%
Merger Agreement with Republic Airways Holdings Inc. [Member] \| Subsequent Event [Member] \| Republic [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of non-employee directors \| NonEmployeeDirector		6
Merger Agreement with Republic Airways Holdings Inc. [Member] \| Subsequent Event [Member] \| Mesa [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of non-employee directors \| NonEmployeeDirector		1
Merger Agreement with Republic Airways Holdings Inc. [Member] \| Stockholders of Republic [Member] \| Subsequent Event [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Percenatge of interest upon effectiveness of the Merger		88.00%
Merger Agreement with Republic Airways Holdings Inc. [Member] \| Stockholders of Mesa [Member] \| Subsequent Event [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Percenatge of interest upon effectiveness of the Merger		6.00%
Merger Agreement with Republic Airways Holdings Inc. [Member] \| Additional Equity Interests [Member] \| Maximum [Member] \| Subsequent Event [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Percenatge of interest upon effectiveness of the Merger		6.00%
Merger Agreement with Republic Airways Holdings Inc. [Member] \| Ownership Limitation Post-Merger [Member] \| Subsequent Event [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Percenatge of interest upon effectiveness of the Merger													30.00%
CRJ-900 Aircraft [Member] \| United Capacity Purchase Agreement [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of aircrafts operated \| AirCraft								6
CRJ-900 Aircraft [Member] \| Capacity Purchase Agreement ("CPA") with United [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of aircrafts operated \| AirCraft								6
CRJ-900 Covered Aircraft [Member] \| United Capacity Purchase Agreement [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of aircrafts to be removed \| AirCraft						8
E-175 Aircraft [Member] \| United Capacity Purchase Agreement [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of aircrafts operated \| AirCraft								54
Number of aircrafts to be removed \| AirCraft								10
Boeing 737400F [Member] \| DHL Flight Services Agreement [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of aircrafts operated \| AirCraft							4
CRJ-Related Assets [Member] \| Merger Agreement with Republic Airways Holdings Inc. [Member] \| Subsequent Event [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Assets not sold														3	11
United [Member] \| E-175 Aircraft [Member] \| United Capacity Purchase Agreement [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of aircrafts operated \| AirCraft								50
Lease expiration year										2028
Number of aircrafts owned \| AirCraft								10
Notice period for termination of agreement								United, subject to certain conditions, including the payment of certain costs tied to aircraft type, to terminate the agreement in its discretion, or remove aircraft from service, by giving us notice of 90 days or more
United [Member] \| E-175 Aircraft [Member] \| Capacity Purchase Agreement ("CPA") with United [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of aircrafts operated \| AirCraft										54
United [Member] \| E-175 Aircraft [Member] \| Maximum [Member] \| United Capacity Purchase Agreement [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Lease expiration year								2028
United [Member] \| E-175 Aircraft [Member] \| Minimum [Member] \| United Capacity Purchase Agreement [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Lease expiration year								2025
United [Member] \| E-175 Aircraft [Member] \| December 31, 2024 and January 31, 2025 [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of aircraft sold \| AirCraft					18
Proceeds from sale of asset					$ 227,700
Discounted amount					$ 20,000
Number of aircrafts owned \| AirCraft					60
United [Member] \| E-175 Aircraft [Member] \| December 31, 2024 and January 31, 2025 [Member] \| Pay off Outstanding Debt [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Proceeds from sale of asset					$ 69,600
United [Member] \| E-175 Aircraft [Member] \| December 31, 2024 and January 31, 2025 [Member] \| Withheld by United for Assumption of Debt [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Proceeds from sale of asset					$ 73,400
United [Member] \| E175LL Aircraft [Member] \| United Capacity Purchase Agreement [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
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
United [Member] \| CRJ-900 and E-175 Aircraft [Member] \| United Capacity Purchase Agreement [Member] \| Subsequent Event [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of combined fleet \| AirCraft				60
Decrease in Scheduled Flying Activity [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Net loss								$ (111,900)
impairment expense								65,700
Loss on sale of assets								$ 46,700