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Special Items (Details) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2021 USD ($) aircraft | Dec. 31, 2021 USD ($) aircraft | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) aircraft | Jul. 31, 2018 aircraft
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |
CARES Act payroll support grant recognition |  | $ (830,000) | $ (685,000) | $ 0 |
CARES Act employee retention credit |  | (11,000) | (36,000) | 0 |
Union contract costs |  | 8,000 | 0 | 8,000 |
Fleet impairment |  | 0 | 273,000 | 0 |
Severance and benefit costs |  | 0 | 59,000 | 0 |
Losses on sale-leaseback transactions |  | 0 | (106,000) | 0 |
Embraer E190 fleet transition costs |  | 0 | 0 | 6,000 |
Total |  | (833,000) | (283,000) | 14,000 |
Special Items, CARES Act Payroll Support |  | 830,000 | 685,000 | 0 |
Wages paid |  | 5 |  |  |
ERC as contra-expense |  | 11,000 | 36,000 |  |
Ratification bonus | $ 8,000 |  |  |  |
Severance and benefit costs, disbursed |  | 44,000 |  |  |
Proceeds from sale leaseback transactions |  |  | 563,000 |  |
Proceeds from sale-leaseback transactions |  | 0 | 354,000 | 0 |
Proceeds from sale-leaseback transactions |  | $ 0 | $ 209,000 | $ 0 |
A220-300 |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |
Number of optional aircraft converted to firm orders | aircraft |  |  |  |  | 60
Number of aircraft having purchase options | aircraft |  |  |  |  | 60
Number of options converted into firm orders | aircraft |  |  |  | 10 |
Options for aircraft deliveries remaining available | aircraft | 50 | 50 |  |  |

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