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Long-Term Debt, Finance Leases, and Other Borrowings - Additional Information (Detail) |  |  |  |  |  |  |  |  |  | 1 Months Ended | 2 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |  |
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Mar. 18, 2025 | Dec. 23, 2024 | Nov. 23, 2024 | Oct. 01, 2024 USD ($) | Jul. 01, 2024 USD ($) | Jan. 11, 2024 USD ($) | Sep. 06, 2023 USD ($) | Dec. 27, 2022 USD ($) | Oct. 30, 2020 USD ($) $ / shares shares | Dec. 31, 2015 USD ($) | Nov. 22, 2024 | Mar. 31, 2025 USD ($) $ / shares | Mar. 31, 2025 USD ($) $ / shares | Jun. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) $ / shares | Jul. 16, 2024 USD ($) | Sep. 30, 2023 USD ($) | Dec. 31, 2020 USD ($) | Nov. 14, 2020 USD ($) | Nov. 13, 2020 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property and equipment, net |  |  |  |  |  |  |  |  |  |  |  | $ 36,846,000 | $ 36,846,000 |  | $ 426,351,000 |  | $ 698,022,000 |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |  |  |  | 130,255,000 | 130,255,000 |  | 310,271,000 |  | 528,278,000 |  |  |
Debt outstanding |  |  |  |  |  |  |  |  |  |  |  | $ 131,678,000 | $ 131,678,000 |  | $ 315,210,000 |  | 538,300,000 |  |  |
Warrants of common stock exercise price | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ 3.98 | $ 3.98 |  | $ 3.98 |  |  |  |  |
Principal payments |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 23,300,000 |  |  |  |  |
Property and equipment-gross |  |  |  |  |  |  |  |  |  |  |  | $ 75,247,000 | $ 75,247,000 |  | 600,924,000 |  | $ 1,049,203,000 |  |  |
E175 Aircraft [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining Balance |  |  |  |  |  |  |  |  |  | $ 73,400,000 |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining Balance |  |  |  | $ 73,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 113,700,000 |  |  |  |  |
Principal payments |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25,400,000 |  |  |  |  |
Treasury Loan [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum collateral coverage ratio covenant |  |  | 1.55 |  |  |  |  |  |  |  | 1.44 |  |  |  |  |  |  |  |  |
Treasury Loan [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Calculated collateral coverage ratio |  |  |  |  |  |  |  |  | 1.55 |  |  |  |  |  |  |  |  |  |  |
Treasury Loan [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional collateral coverage ratio |  |  |  |  |  |  |  |  | 1.55 |  |  |  |  |  |  |  |  |  |  |
Loan Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured term loan facility, amount borrowed |  |  |  |  |  |  |  |  | $ 43,000,000 |  |  |  |  |  |  |  |  |  |  |
Secured term loan facility, additional amount borrowed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 152,000,000
Warrants to purchase shares of common stock | shares |  |  |  |  |  |  |  |  | 4,899,497 |  |  |  |  |  |  |  |  |  |  |
Warrants of common stock exercise price | $ / shares |  |  |  |  |  |  |  |  | $ 3.98 |  |  |  |  |  |  |  |  |  |  |
Debt issuance costs allocated to warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000 |  |  |  |  |
Loan Agreement [Member] | EDC Loans [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issuance costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,100,000
Loan Agreement [Member] | FortyThreeMillionTreasuryLoanMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capitalized debt issuance costs, net |  |  |  |  |  |  |  |  | $ 700,000 |  |  |  |  |  |  |  |  |  |  |
Loan Agreement [Member] | $152M Treasury Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capitalized debt issuance costs, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,300,000
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of long term debt |  |  |  |  |  | $ 2,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Permitted amount to redraw from existing credit facility |  |  |  |  |  |  | $ 7,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving commitments |  |  |  |  |  |  | 50,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving commitments |  |  |  |  |  |  | $ 30,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Equipment Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 85,500,000 |  |  |  |  |
Secured Term Loan Facility [Member] | Loan Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured term loan facility, maximum borrowing capacity |  |  |  |  |  |  |  |  | 200,000,000 |  |  |  |  |  |  |  |  |  |  |
Secured Term Loan Facility [Member] | Loan Agreement [Member] | Treasury Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured term loan facility, amount borrowed |  |  |  |  |  |  |  |  | $ 43,000,000 |  |  |  |  |  |  |  |  | $ 195,000,000 |  |
Secured term loan facility, additional amount borrowed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 152,000,000
Debt instrument, maturity date |  |  |  |  |  |  |  |  | Oct. 30, 2025 |  |  |  |  |  |  |  |  |  |  |
Long term debt, basis spread on variable rate |  |  |  |  |  |  |  |  | 3.50% |  |  |  |  |  |  |  |  |  |  |
Percentage of all in rate |  |  |  |  |  |  |  |  |  |  |  | 8.06% | 8.06% |  |  |  |  |  |  |
UST Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 113,700,000 |  |  |  |  |
UST Loan [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum Collateral Coverage Ratio 1 |  | 1.55 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
UST Loan [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum Collateral Coverage Ratio 1 | 0.91 | 0.99 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
UST Loan [Member] | Minimum [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum Collateral Coverage Ratio 1 | 0.91 | 0.99 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
United Capacity Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of long term debt |  |  |  |  |  | $ 10,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum liquidity requirement of cash and cash equivalents |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 15,000,000 |  |  |  |
United Capacity Purchase Agreement [Member] | United Airlines Inc [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of controllable completion factor |  |  |  |  |  |  |  |  |  |  |  |  | 99.30% |  | 99.30% |  |  |  |  |
United Capacity Purchase Agreement [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of lines of credit |  |  |  |  |  |  |  |  |  |  |  | $ 10,500,000 |  |  | $ 10,500,000 |  |  |  |  |
Long term debt, basis spread on variable rate |  |  |  |  |  |  | 3.50% | 3.50% |  |  |  |  |  |  |  |  |  |  |  |
Revolving loan |  |  |  |  |  |  |  | $ 10,500,000 |  |  |  |  |  |  |  |  |  |  |  |
Revolving commitments |  |  |  |  |  |  |  | 30,700,000 |  |  |  |  |  |  |  |  |  |  |  |
Covenant capping restricted payments |  |  |  |  |  |  |  | $ 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Rental coverage ratio |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |
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% | 4.50% |  |  |  |  |  |  |  |  |  |  |  |
United Capacity Purchase Agreement [Member] | Revolving Credit Facility [Member] | United Airlines Inc [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount funded by company |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25,500,000 | 25,500,000 |  |  |  |  |
Additional prepayment with potential forgiveness |  |  |  |  |  |  |  |  |  |  |  | 15,000,000 | $ 15,000,000 |  | 15,000,000 |  |  |  |  |
Deemed prepayment, outstanding |  |  |  |  |  |  |  |  |  |  |  | 4,500,000 | 4,500,000 |  | 4,500,000 |  |  |  |  |
United Capacity Purchase Agreement [Member] | Revolving Credit Facility [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount required |  |  |  |  |  |  |  | $ 15,000,000 |  |  |  |  |  | $ 15,000,000 |  |  |  |  |  |
Fee waiver granted on minimum liquidity requirement |  |  |  |  | $ 15,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aircraft and Equipment [Member] | Pledged as Collateral [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property and equipment, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 438,400,000 |  |  |  |  |
Property and equipment-gross |  |  |  |  |  |  |  |  |  |  |  | $ 60,400,000 | $ 60,400,000 |  |  |  |  |  |  |

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- Definition Additional collateral coverage ratio. + References No definition available. + Details
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- Definition Fee waiver granted on minimum liquidity requirement. + References No definition available. + Details
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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481112/505-10-50-3 + Details
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- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481112/505-10-50-3 + Details
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