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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