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Special Charges (Credits) - Narrative (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 USD ($) aircraft | Mar. 31, 2021 USD ($) employee | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) aircraft employee | Sep. 30, 2020 USD ($) | Feb. 28, 2021 aircraft
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Government assistance received |  |  |  | $ 5,800,000 | $ 5,100,000 |
Government assistance received through unsecured loans |  |  |  | 1,700,000 | 1,500,000 |
Government assistance received through grants |  |  |  |  | 3,600,000 |
Issuance of warrants |  |  |  |  | 66,000 |
Impairment of assets | $ 46,000 |  | $ 38,000 | 105,000 | 168,000 |
Severance and benefit costs | 5,000 |  | 350,000 | 433,000 | 413,000 |
Total net other gains (charges) | 17,000 |  |  | (60,000) |  |
Nonoperating unrealized gains (losses) | (34,000) |  | 15,000 | 91,000 | (295,000) |
Non-operating losses |  |  |  |  | 271,000 |
Debt extinguishment costs |  |  |  | 50,000 |  |
CARES Act grant | 1,132,000 |  | 1,494,000 | 4,021,000 | 3,083,000 |
Gain for the change in fair value of certain derivative assets |  |  |  |  | 24,000 |
Settlement loss | 0 |  | 415,000 | 46,000 | 646,000 |
Nonoperating credit loss on BRW Term Loan and related guarantee | $ 0 |  |  | $ 0 | 697,000 |
Airbus A319 |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Number of impaired aircraft | aircraft | 9 |  |  | 9 |  |
Boeing 737-700 |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Number of impaired aircraft | aircraft | 13 |  |  | 13 |  |
Embraer EMB 145LR |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Impairment of assets |  |  |  | $ 59,000 |  |
Number of impaired aircraft | aircraft | 64 |  |  | 64 |  |
Boeing 777-200/200ER |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Number of aircraft temporarily removed | aircraft |  |  |  |  |  | 52
Embedded Aircraft Lease |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Operating lease, impairment loss |  |  | $ 38,000 |  | 38,000 |
Payroll Support Program 2 & 3 (PSP 2 & 3) Warrants |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Issuance of warrants |  |  |  | $ 99,000 |  |
PSP 2 & 3 Note |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Government assistance received through grants | $ 1,100,000 |  |  | $ 4,000,000 |  |
BRW |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Nonoperating credit loss on BRW Term Loan and related guarantee |  |  |  |  | 697,000 |
Routes |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Impairment of intangible assets |  |  |  |  | $ 130,000 |
Employee Separation | Voluntary Separation Leave Programs |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Number of employees electing to voluntarily separate from the company | employee |  | 4,500 |  | 4,500 |  |
Special termination benefits related to VSL programs |  | $ 46,000 |  | $ 46,000 |  |
Employee Separation | Voluntary Separation Leave Programs | Full-Time Employees |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
One-time per employee contribution for special termination benefits related to VSL programs |  | 125 |  |  |  |
Employee Separation | Voluntary Separation Leave Programs | Part-Time Employees |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
One-time per employee contribution for special termination benefits related to VSL programs |  | $ 75 |  |  |  |

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