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Flying Agreements and Airport Customer Service and Other Revenues (Details)
$ in Thousands
3 Months Ended 12 Months Ended 21 Months Ended
Mar. 31, 2019
USD ($)
aircraft
Jun. 30, 2018
aircraft
Mar. 31, 2018
USD ($)
Dec. 31, 2016
item
Dec. 31, 2020
aircraft
Dec. 31, 2018
USD ($)
Agreements with other airlines            
Percentage of ASMs flown under fixed-fee arrangements 84.80%          
Percentage of ASMs flown under pro-rate arrangements 15.20%          
Revenues [Abstract]            
Operating revenues | $ $ 723,694   $ 783,400      
future minimum rental income            
April 2019 through December 2019 | $ 18,495          
2020 | $ 13,034          
2021 | $ 7,956          
2022 | $ 3,125          
2023 | $ 185          
Total | $ 42,795          
Property and equipment and related assets | $ $ 5,274,568         $ 5,005,744
Sky West Airlines Inc | Delta Connection Prorate Agreement            
future minimum rental income            
Number of aircraft 29          
Term of agreement 30 days          
Sky West Airlines Inc | United Express Prorate Agreement            
future minimum rental income            
Number of aircraft 25          
Term of agreement 120 days          
Sky West Airlines Inc | American Capacity Purchase Agreement            
future minimum rental income            
Number of aircraft 62          
Sky West Airlines Inc | American Prorate Agreement            
future minimum rental income            
Term of agreement 120 days          
Third Party Lease            
future minimum rental income            
Property and equipment and related assets | $ $ 23,200          
CRJ 200            
future minimum rental income            
Number of seats on aircraft | item       50    
CRJ 200 | Sky West Airlines Inc | Delta Connection Agreement            
future minimum rental income            
Number of aircraft 58          
CRJ 200 | Sky West Airlines Inc | United Express Agreements            
future minimum rental income            
Number of aircraft 68          
CRJ 200 | Sky West Airlines Inc | American Prorate Agreement            
future minimum rental income            
Number of aircraft 7          
CRJ 700 | Sky West Airlines Inc | Delta Connection Agreement            
future minimum rental income            
Number of aircraft 18          
CRJ 700 | Sky West Airlines Inc | United Express Agreements            
future minimum rental income            
Number of aircraft 19          
CRJ 700 | Sky West Airlines Inc | American Capacity Purchase Agreement            
future minimum rental income            
Number of aircraft 62          
CRJ 900 | Delta Connection Agreement            
future minimum rental income            
Number of aircraft 8 20        
CRJ 900 | Forecast | Delta Connection Agreement            
future minimum rental income            
Number of aircraft         12  
CRJ 900 | Sky West Airlines Inc | Delta Connection Agreement            
future minimum rental income            
Number of aircraft 43          
E 175 | Sky West Airlines Inc            
future minimum rental income            
Number of aircraft within one year 2019 4          
Number of aircraft within two year 2020 4          
E 175 | Sky West Airlines Inc | Delta Connection Agreement            
future minimum rental income            
Number of aircraft 50          
Number of aircrafts to be placed in service 8          
E 175 | Sky West Airlines Inc | United Express Agreements            
future minimum rental income            
Number of aircraft 65          
E 175 | Sky West Airlines Inc | Alaska Capacity Purchase Agreement            
future minimum rental income            
Number of aircraft 32          
Number of aircrafts to be placed in service 3          
Flying agreements            
Revenues [Abstract]            
Operating revenues | $ $ 700,001   767,964      
Flight operations            
Revenues [Abstract]            
Operating revenues | $ 386,545   469,025      
Aircraft rentals            
Revenues [Abstract]            
Operating revenues | $ 207,381   189,068      
Prorate agreements            
Revenues [Abstract]            
Operating revenues | $ $ 106,075   $ 109,871