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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 |  |  |  |  |  |  |

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