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Flying Agreements and Airport Customer Service and Other Revenues (Details)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
USD ($)
aircraft
Jun. 30, 2018
USD ($)
aircraft
Dec. 31, 2019
aircraft
Jun. 30, 2019
USD ($)
aircraft
Jun. 30, 2018
USD ($)
Dec. 31, 2016
item
Dec. 31, 2018
USD ($)
Agreements with other airlines              
Percentage of ASMs flown under fixed-fee arrangements       83.10%      
Percentage of ASMs flown under pro-rate arrangements       16.90%      
Revenues [Abstract]              
Operating revenues | $ $ 744,383 $ 805,515   $ 1,468,077 $ 1,588,915    
future minimum rental income              
July 2019 through December 2019 | $ 9,530     9,530      
2020 | $ 9,523     9,523      
2021 | $ 8,976     8,976      
2022 | $ 4,099     4,099      
2023 | $ 1,205     1,205      
Thereafter | $ 5,780     5,780      
Total | $ 39,113     39,113      
Property and equipment and related assets | $ 5,291,046     $ 5,291,046     $ 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       28      
Term of agreement       120 days      
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 | $ $ 35,600     $ 35,600      
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       57      
CRJ 200 | Sky West Airlines Inc | United Express Agreements              
future minimum rental income              
Number of aircraft       69      
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       16      
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       64      
CRJ 700 | American | Forecast              
future minimum rental income              
Number of aircraft     10        
Number of aircraft - acquired from third party     7        
Number of aircraft - internal source     3        
CRJ 900 | Delta Connection Agreement              
future minimum rental income              
Number of aircraft to be delivered in 2020 9     9      
CRJ 900 | Sky West Airlines Inc | Delta Connection Agreement              
future minimum rental income              
Number of aircraft       42      
Number of additional aircraft placed into service       11      
CRJ 900 | Sky West Airlines Inc | Delta Connection Agreement | Minimum              
future minimum rental income              
Number of aircraft   20          
E 175 | Sky West Airlines Inc | Delta Connection Agreement              
future minimum rental income              
Number of aircraft       54      
Number of aircraft to be delivered in 2020 4     4      
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 aircraft to be delivered 2021 3     3      
Flying agreements              
Revenues [Abstract]              
Operating revenues | $ $ 725,335 $ 793,637   $ 1,425,336 1,561,602    
Flight operations              
Revenues [Abstract]              
Operating revenues | $ 383,732 462,824   770,278 931,849    
Aircraft lease              
Revenues [Abstract]              
Operating revenues | $ 206,678 201,306   414,059 390,375    
Prorate agreements              
Revenues [Abstract]              
Operating revenues | $ $ 134,925 $ 129,507   $ 240,999 $ 239,378