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Impact of the COVID-19 Pandemic (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Jan. 22, 2019
Jun. 30, 2020
aircraft
Dec. 31, 2020
USD ($)
item
aircraft
$ / shares
shares
Oct. 28, 2020
USD ($)
Sep. 30, 2020
USD ($)
Apr. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Unusual or Infrequent Item, or Both [Line Items]              
Liquid Assets     $ 1,530,400        
Cash and Marketable Securities     825,900        
Line of credit facility, reduction of amount available     39,500        
Borrowed amount     $ 3,236,002       $ 3,017,523
Interest rate (as a percent) 6.85%            
COVID-19              
Unusual or Infrequent Item, or Both [Line Items]              
Decrease in departures (as a percent)     30.50%        
Decrease in block hours (as a percent)     33.50%        
Maximum              
Unusual or Infrequent Item, or Both [Line Items]              
CARES Act, secured loans to airline industry     $ 25,000,000        
PSP agreement              
Unusual or Infrequent Item, or Both [Line Items]              
Grants receivable     450,700   $ 450,700 $ 438,000  
Proceeds     $ 345,500        
CRJ 200 | Sky West Airlines Inc              
Unusual or Infrequent Item, or Both [Line Items]              
Number of aircraft removed from service | aircraft     55        
CRJ 200 | Sky West Airlines Inc | American Prorate Agreement              
Unusual or Infrequent Item, or Both [Line Items]              
Number of aircraft removed from service | aircraft   7          
Grant | PSP agreement              
Unusual or Infrequent Item, or Both [Line Items]              
Principal amount     $ 345,500        
Unsecured term loan | PSP agreement              
Unusual or Infrequent Item, or Both [Line Items]              
Principal amount     $ 105,200        
Debt term     10 years        
Unsecured term loan | First five years | PSP agreement              
Unusual or Infrequent Item, or Both [Line Items]              
Interest rate (as a percent)     1.00%        
Unsecured term loan | Final five years | PSP agreement              
Unusual or Infrequent Item, or Both [Line Items]              
Interest rate (as a percent)     2.00%        
Secured loan              
Unusual or Infrequent Item, or Both [Line Items]              
Borrowed amount     $ 60,000        
Number of subsequent borrowings | item     2        
Interest rate (as a percent)     3.22%        
Warrants to purchase shares | shares     211,416        
Warrants exercise price | $ / shares     $ 28.38        
Warrant term     5 years        
Maximum borrowing capacity       $ 725,000 573,000    
Secured loan | COVID-19              
Unusual or Infrequent Item, or Both [Line Items]              
Liquid Assets     $ 665,000        
Secured loan | LIBOR              
Unusual or Infrequent Item, or Both [Line Items]              
Basis spread on variable rate     3.00%        
Secured loan              
Unusual or Infrequent Item, or Both [Line Items]              
Borrowed amount     $ 60,000        
Number of subsequent borrowings | aircraft     2        
Warrants to purchase shares | shares     211,416        
Warrants exercise price | $ / shares     $ 28.38        
Warrant term     5 years        
Maximum borrowing capacity       $ 725,000 $ 573,000    
Warrant Shares | PSP agreement              
Unusual or Infrequent Item, or Both [Line Items]              
Warrants to purchase shares | shares     370,720        
Warrants exercise price | $ / shares     $ 28.38        
Warrant term     5 years