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Special Charges (Credits) - Narrative (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) numberOfEmployees aircraft | Dec. 31, 2020 USD ($) plane
Special Charges [Line Items] |  |  |  |
Gain on sale of assets and other special charges |  | $ (140,000) | $ (119,000) | $ (27,000)
Loss contingency, loss in period |  | 94,000 |  |
Loss contingency contract disputes |  | 23,000 |  |
Nonoperating unrealized (gains) losses on investments, net |  | (20,000) | 34,000 | 194,000
Cash received under the payroll support program |  |  | 5,800,000 | 5,100,000
Proceeds from the issuance of an unsecured loan |  |  | 1,700,000 | 1,500,000
Proceeds from issuance of warrants |  |  |  | 66,000
Severance and benefit expenses |  | 0 | 438,000 | 575,000
Impairment of assets |  | 0 | $ 97,000 | 318,000
Number of aircraft and spare engines retired | aircraft |  |  | 64 |
Gain (loss) on net charges |  |  | $ 119,000 |
Extinguishment of debt, amount |  | 7,000 | 50,000 |
Grant income |  |  |  | 3,600,000
Impairment of right-of-use assets |  |  |  | 38,000
Impairments related to cancelled projects |  |  |  | 56,000
Settlement losses related to defined benefit pension plans |  | 0 | 31,000 | 687,000
Expected credit loss allowance recorded |  | 0 | $ 0 | 697,000
Unsecured Debt |  |  |  |
Special Charges [Line Items] |  |  |  |
Long term debt |  | $ 400,000 |  |
Fixed interest rate |  | 4.25% |  |
Employee Separation | Voluntary Separation Leave Programs |  |  |  |
Special Charges [Line Items] |  |  |  |
Number of employees electing to voluntarily separate from the company | numberOfEmployees |  |  | 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 | 3,500,000
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 |
Boeing 757-200 |  |  |  |
Special Charges [Line Items] |  |  |  |
Tangible asset impairment charges |  |  |  | $ 94,000
Number of planes permanently grounded | plane |  |  |  | 11
Routes |  |  |  |
Special Charges [Line Items] |  |  |  |
Intangible assets impairment charges |  |  |  | $ 130,000

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