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Flying Agreements Revenue and Lease, Airport Services and Other Revenues (Details)
$ in Thousands
3 Months Ended
Jan. 01, 2020
USD ($)
Mar. 31, 2021
USD ($)
aircraft
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Agreements with other airlines        
Percentage of ASMs flown under fixed-fee arrangements   86.60% 85.90%  
Percentage of ASMs flown under pro-rate arrangements   13.40% 14.10%  
Revenues [Abstract]        
Operating revenues   $ 534,555 $ 729,936  
Rental income under operating leases        
Operating lease revenue   14,950 10,546  
Future minimum rental income        
April 2021 through December 2021   34,167    
2022   45,391    
2023   44,848    
2024   42,530    
2025   39,082    
Thereafter   155,089    
Total   $ 361,107    
Percentage of reduction in completed departures of flights   26.00%    
Percentage of reduction in completed block hours of flights   23.00%    
Deferred revenue   $ 131,900    
Deferred revenue in other current liabilities   19,900    
Deferred revenue in other long-term liabilities   112,000    
Deferred revenue during the period   21,200    
Property and equipment and related assets   5,313,660   $ 5,362,048
Credit loss reserve   45,900 46,200  
Credit loss   300    
Topic 326        
Future minimum rental income        
Credit loss $ 11,600      
Third Party Lease        
Future minimum rental income        
Property and equipment and related assets   $ 268,200    
CRJ 200 | Sky West Airlines Inc | Delta Connection Prorate Agreement        
Future minimum rental income        
Number of aircraft | aircraft   29    
Agreement term   30 days    
CRJ 200 | Sky West Airlines Inc | United Express Agreements        
Future minimum rental income        
Number of aircraft | aircraft   70    
CRJ 200 | Sky West Airlines Inc | United Express Prorate Agreement        
Future minimum rental income        
Number of aircraft | aircraft   38    
Agreement term   120 days    
CRJ 700        
Future minimum rental income        
Number of aircraft under firm purchase commitment | aircraft   8    
CRJ 700 | Sky West Airlines Inc | Delta Connection Agreement        
Future minimum rental income        
Number of aircraft | aircraft   5    
CRJ 700 | Sky West Airlines Inc | United Express Agreements        
Future minimum rental income        
Number of aircraft | aircraft   19    
CRJ 700 | Sky West Airlines Inc | American Capacity Purchase Agreement        
Future minimum rental income        
Number of aircraft | aircraft   74    
Number of aircraft under firm purchase commitment | aircraft   16    
CRJ 900 | Sky West Airlines Inc | Delta Connection Agreement        
Future minimum rental income        
Number of aircraft | aircraft   40    
E175        
Future minimum rental income        
Number of aircraft under firm purchase commitment | aircraft   20    
E175 | Sky West Airlines Inc | Delta Connection Agreement        
Future minimum rental income        
Number of aircraft | aircraft   71    
E175 | Sky West Airlines Inc | United Express Agreements        
Future minimum rental income        
Number of aircraft | aircraft   90    
E175 | Sky West Airlines Inc | Alaska Capacity Purchase Agreement        
Future minimum rental income        
Number of aircraft | aircraft   32    
Number of aircraft under firm purchase commitment | aircraft   20    
Current assets        
Future minimum rental income        
Gross receivables current   $ 65,500    
Other noncurrent assets        
Future minimum rental income        
Gross receivables Non-current   219,800    
Flying agreements        
Revenues [Abstract]        
Operating revenues   511,191 709,494  
Flight operations        
Revenues [Abstract]        
Operating revenues   211,052 366,409  
Aircraft lease and fixed revenue        
Revenues [Abstract]        
Operating revenues   231,491 242,734  
Prorate agreements        
Revenues [Abstract]        
Operating revenues   68,648 100,351  
Airport customer service and other revenue        
Revenues [Abstract]        
Operating revenues   8,414 9,896  
Lease, airport services and other        
Revenues [Abstract]        
Operating revenues   $ 23,364 $ 20,442