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Special Items (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2020
USD ($)
Apr. 23, 2020
USD ($)
Dec. 31, 2020
USD ($)
option
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2020
USD ($)
option
Dec. 31, 2019
USD ($)
option
Dec. 31, 2018
USD ($)
Special Items                      
CARES Act payroll support grant recognition     $ 685,000           $ (685,000) $ 0 $ 0
CARES Act employee retention credit                 (36,000)
Fleet impairment                 273,000 0 0
Severance and benefit costs                 59,000 0 0
Losses on sale-leaseback transactions                 (106,000) 0 0
Embraer E190 fleet transition costs                 0 6,000 362,000
Union contract costs                 0 8,000 73,000
Total     $ (69,000) $ (112,000) $ (304,000) $ 202,000 $ 2,000 $ 12,000 (283,000) 14,000 435,000
Effective income tax reconciliation, discrete tax effects, Net tax deficiencies                 963,000    
CARES act, payroll support program, grant $ 19,000 $ 685,000   $ 19,000         704,000    
Wages paid                 5    
ERC as contra-expense                 36,000    
Severance and benefit costs, disbursed                 44,000    
Proceeds from sale leaseback transactions                 563,000    
Proceeds from sale-leaseback transactions                 354,000 0 0
Proceeds from sale-leaseback transactions                 209,000 0 0
Impairment of long-lived assets                 $ 273,000 $ 0 319,000
Ratification bonus                     $ 50,000
A220-300                      
Special Items                      
Number of options converted into firm orders | option                   10  
Options for aircraft deliveries remaining available | option     50           50    
Unsecured Debt | US Department of Treasury                      
Special Items                      
Debt instrument, face amount     $ 259,000           $ 259,000