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Flying Agreements Revenue and Lease, Airport Services and Other Revenues - Flying Agreements (Details)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Oct. 31, 2020
USD ($)
aircraft
Dec. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
aircraft
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Agreements with other airlines              
Percentage of ASMs flown under fixed-fee arrangements         87.20% 82.10%  
Percentage of ASMs flown under pro-rate arrangements         12.80% 17.90%  
Revenues [Abstract]              
Operating revenues     $ 457,493 $ 760,295 $ 1,537,469 $ 2,228,372  
Rental income under operating leases              
Operating lease revenue     7,136 10,075 27,162 28,113  
Future minimum rental income              
October 2020 through December 2020     6,170   6,170    
2021     24,780   24,780    
2022     24,596   24,596    
2023     21,643   21,643    
2024     21,336   21,336    
Thereafter     70,938   70,938    
Total     $ 169,463   169,463    
Percentage of reduction in completed departures of flights     37.00%        
Percentage of reduction in completed block hours of flights     41.00%        
Deferred revenue     $ 98,600   98,600    
Deferred revenue during the period     29,600        
Property and equipment and related assets     5,207,746   5,207,746   $ 5,394,681
Balance $ 39,648 $ 39,648     15,388    
Additions to credit loss reserve         24,260    
Balance     39,648   $ 39,648    
Sky West Airlines Inc | Delta Connection Prorate Agreement              
Future minimum rental income              
Number of aircraft | aircraft         21    
Agreement term         30 days    
Sky West Airlines Inc | United Express Prorate Agreement              
Future minimum rental income              
Number of aircraft | aircraft         26    
Agreement term         120 days    
Third Party Lease              
Future minimum rental income              
Property and equipment and related assets     126,200   $ 126,200    
CRJ 200 | Sky West Airlines Inc | Delta Connection Agreement              
Future minimum rental income              
Number of aircraft | aircraft         17    
Number of aircrafts terminated | aircraft         19    
Number of aircraft parked and stored | aircraft         17    
Number of aircraft parked | aircraft         19    
Average age of aircraft         18 years    
Depreciation expense     20,200        
CRJ 200 | Sky West Airlines Inc | United Express Agreements              
Future minimum rental income              
Number of aircraft | aircraft         70    
CRJ 200 | Sky West Airlines Inc | American Prorate Agreement              
Future minimum rental income              
Number of aircrafts terminated | aircraft         7    
CRJ 200 | Sky West Airlines Inc | Forecast | Delta Connection Agreement              
Future minimum rental income              
Depreciation expense   $ 8,500          
CRJ 700 | American Capacity Purchase Agreement              
Future minimum rental income              
Number of aircraft | aircraft         61    
Number of aircraft to be placed by 2021 | aircraft 29            
Number of additional aircraft to be operated | aircraft 20            
Total number of aircraft operated | aircraft 90       70    
CRJ 700 | Sky West Airlines Inc | Delta Connection Agreement              
Future minimum rental income              
Number of aircraft | aircraft         6    
CRJ 700 | Sky West Airlines Inc | United Express Agreements              
Future minimum rental income              
Number of aircraft | aircraft         19    
CRJ 900 | Sky West Airlines Inc | Delta Connection Agreement              
Future minimum rental income              
Number of aircraft | aircraft         39    
CRJ 900 | Sky West Airlines Inc | Delta Connection Prorate Agreement              
Future minimum rental income              
Number of aircraft to be placed in service | aircraft         1    
Agreement term         9 years    
E175 | Sky West Airlines Inc | Delta Connection Agreement              
Future minimum rental income              
Number of aircraft | aircraft         67    
E175 | Sky West Airlines Inc | Delta Connection Prorate Agreement              
Future minimum rental income              
Number of aircraft to be placed in service | aircraft         4    
E175 | Sky West Airlines Inc | United Express Agreements              
Future minimum rental income              
Number of aircraft | aircraft         90    
E175 | Sky West Airlines Inc | American Prorate Agreement              
Future minimum rental income              
Number of aircraft to be placed in service | aircraft         20    
Current assets              
Future minimum rental income              
Gross receivables current     49,000   $ 49,000    
Other noncurrent assets              
Future minimum rental income              
Gross receivables Non-current     171,200   171,200    
Flying agreements              
Revenues [Abstract]              
Operating revenues     445,048 738,838 1,490,912 2,164,173  
Rental income under operating leases              
Total operating revenues     445,048 738,838 1,490,912 2,164,173  
Flight operations              
Rental income under operating leases              
Total operating revenues     175,753 385,537 674,222 1,155,814  
Aircraft lease and fixed revenue              
Rental income under operating leases              
Total operating revenues     208,516 207,467 619,354 621,526  
Prorate agreements              
Rental income under operating leases              
Total operating revenues     60,779 145,834 197,336 386,833  
Lease, airport services and other              
Rental income under operating leases              
Total operating revenues     12,445 21,457 46,557 64,199  
Airport customer service and other              
Rental income under operating leases              
Total operating revenues     $ 5,309 $ 11,382 $ 19,395 $ 36,086