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Special Charges (Credits) - Narrative (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) aircraft employee
Special Charges [Line Items] |  |  |  |
Labor contract ratification bonuses |  | $ 814,000 | $ 0 | $ 0
Gain on sale of assets and other special charges |  | (135,000) | (140,000) | (119,000)
Nonoperating unrealized gains (losses) |  | 27,000 | 20,000 | (34,000)
Deferred Debt Issuance Cost, Writeoff |  | 11,000 |  |
Loss contingency, loss in period |  |  | 94,000 |
Loss contingency contract disputes |  |  | 23,000 |
Extinguishment of debt, amount |  |  | 7,000 | 50,000
Cash received under the payroll support program |  |  |  | 5,800,000
Proceeds from the issuance of an unsecured loan |  |  |  | 1,700,000
Severance and benefit costs |  | 0 | 0 | 438,000
Impairment of assets |  | 0 | 0 | $ 97,000
Number of aircraft and spare engines retired | aircraft |  |  |  | 64
Gain (loss) on net charges |  |  |  | $ (119,000)
Airbus A319 & Boeing 737-700 |  |  |  |
Special Charges [Line Items] |  |  |  |
Impairment of assets |  |  |  | $ 61,000
Airbus A319 |  |  |  |
Special Charges [Line Items] |  |  |  |
Number of aircraft held for sale | aircraft |  |  |  | 13
Boeing 737-700 |  |  |  |
Special Charges [Line Items] |  |  |  |
Number of aircraft held for sale | aircraft |  |  |  | 13
Embraer EMB 145LR |  |  |  |
Special Charges [Line Items] |  |  |  |
Impairment of assets |  |  |  | $ 36,000
Employee Separation | Voluntary Separation Leave Programs |  |  |  |
Special Charges [Line Items] |  |  |  |
Number of employees electing to voluntarily separate from the company | employee |  |  |  | 4,500
Special termination benefits |  |  |  | $ 31,000
Employee Separation | Voluntary Separation Leave Programs | Full-Time Employees |  |  |  |
Special Charges [Line Items] |  |  |  |
Restructuring programs, one-time contribution per employee | $ 125 |  |  | 125
Employee Separation | Voluntary Separation Leave Programs | Part-Time Employees |  |  |  |
Special Charges [Line Items] |  |  |  |
Restructuring programs, one-time contribution per employee | $ 75 |  |  | 75
Payroll Support Program 2 & 3 (PSP 2 & 3) Warrants |  |  |  |
Special Charges [Line Items] |  |  |  |
Proceeds from issuance of warrants |  |  |  | 99,000
Payroll Support Program 2 and 3 (PSP 2 & 3) Note |  |  |  |
Special Charges [Line Items] |  |  |  |
Grant income |  |  |  | $ 4,000,000
Unsecured Debt |  |  |  |
Special Charges [Line Items] |  |  |  |
Prepayment of term loan facility |  | $ 1,000,000 |  |
Long term debt |  |  | $ 400,000 |
Fixed interest rate |  |  | 4.25% |

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