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Special Charges (Credits) and Unrealized (Gains) Losses on Investments - Narrative (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 USD ($) | Dec. 31, 2021 USD ($) employee aircraft | Dec. 31, 2020 USD ($) plane | Dec. 31, 2019 USD ($)
Special Charges [Line Items] |  |  |  |
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 |  | 438,000 | 575,000 | $ 16,000
Impairment of assets |  | $ 97,000 | 318,000 | 171,000
Number of aircraft and spare engines retired | aircraft |  | 64 |  |
Gain (loss) on net charges |  | $ 119,000 |  |
Nonoperating unrealized (gains) losses on investments, net |  | 34,000 | 194,000 | (153,000)
Extinguishment of debt, amount |  | 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 |  | 31,000 | 687,000 | 0
Expected credit loss allowance recorded |  | $ 0 | 697,000 | 0
Write-off of unexercised aircraft purchase |  |  |  | 18,000
Other miscellaneous impairments |  |  |  | 20,000
Charges related to contract terminations |  |  |  | 25,000
Charges for the settlement of certain legal matters |  |  |  | 18,000
Fleet type transaction costs |  |  |  | 14,000
Other charges |  |  |  | 2,000
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 | 3,500,000 |
International Brotherhood of Teamsters |  |  |  |
Special Charges [Line Items] |  |  |  |
Severance and benefit expenses |  |  |  | 2,000
Management |  |  |  |
Special Charges [Line Items] |  |  |  |
Severance and benefit expenses |  |  |  | 14,000
Aircraft Engines |  |  |  |
Special Charges [Line Items] |  |  |  |
Tangible asset impairment charges |  |  |  | 43,000
Hong Kong Routes |  |  |  |
Special Charges [Line Items] |  |  |  |
Intangible assets impairment charges |  |  |  | $ 90,000
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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