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Nature of Operations and Summary of Significant Accounting Policies - Flying Agreements (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2019
USD ($)
aircraft
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2019
USD ($)
aircraft
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Agreements with other airlines                      
Percentage of ASMs flown under fixed-fee arrangements                 82.00%    
Percentage of ASMs flown under pro-rate arrangements                 18.00%    
Revenues [Abstract]                      
Operating revenues | $ $ 743,591 $ 760,295 $ 744,383 $ 723,694 $ 783,400 $ 805,515 $ 829,275 $ 803,489 $ 2,971,963 $ 3,221,679 $ 3,122,592
Rental income under operating leases                      
Operating lease income relating to lease payments | $                 27,552    
Operating lease income relating to lease payments | $                   3,923 3,293
Operating lease income relating to variable lease payments | $                 9,608    
Total operating revenues | $                 2,971,963 3,221,679 3,122,592
future minimum rental income                      
2020 | $ 32,724               32,724    
2021 | $ 31,344               31,344    
2022 | $ 24,786               24,786    
2023 | $ 18,530               18,530    
2024 | $ 18,222               18,222    
Thereafter | $ 54,932               54,932    
Total | $ 180,538               180,538    
Property and equipment and related assets | $ 5,394,681       5,005,744       5,394,681 5,005,744  
Accounts receivable | $ 83,000       64,200       $ 83,000 64,200  
Alaska Capacity Purchase Agreement                      
future minimum rental income                      
Number of aircraft                 32    
Sky West Airlines Inc | Delta Connection Agreement                      
future minimum rental income                      
Agreement term                 4 years 1 month 6 days    
Sky West Airlines Inc | Delta Connection Prorate Agreement                      
future minimum rental income                      
Notice period for termination of agreement                 30 days    
Sky West Airlines Inc | United Express Agreements                      
future minimum rental income                      
Agreement term                 4 years 3 months 18 days    
Sky West Airlines Inc | United Express Prorate Agreement                      
future minimum rental income                      
Notice period for termination of agreement                 120 days    
Sky West Airlines Inc | American Prorate Agreement                      
future minimum rental income                      
Notice period for termination of agreement                 120 days    
Third Party Lease                      
future minimum rental income                      
Property and equipment and related assets | $ $ 97,000               $ 97,000    
CRJ 200                      
future minimum rental income                      
Number of seats on aircraft                 50    
CRJ 200 | American Prorate Agreement                      
future minimum rental income                      
Number of aircraft                 7    
CRJ 200 | Sky West Airlines Inc | Delta Connection Agreement                      
future minimum rental income                      
Number of aircraft                 55    
CRJ 200 | Sky West Airlines Inc | Delta Connection Prorate Agreement                      
future minimum rental income                      
Number of aircraft                 29    
CRJ 200 | Sky West Airlines Inc | United Express Agreements                      
future minimum rental income                      
Number of aircraft                 68    
CRJ 200 | Sky West Airlines Inc | United Express Prorate Agreement                      
future minimum rental income                      
Number of aircraft                 31    
CRJ 700 | Minimum                      
future minimum rental income                      
Number of seats on aircraft                 65    
CRJ 700 | Maximum                      
future minimum rental income                      
Number of seats on aircraft                 76    
CRJ 700 | American Capacity Purchase Agreement                      
future minimum rental income                      
Number of aircraft                 62    
Agreement term                 4 years 1 month 6 days    
CRJ 700 | Sky West Airlines Inc | Delta Connection Agreement                      
future minimum rental income                      
Number of aircraft                 13    
CRJ 700 | Sky West Airlines Inc | United Express Agreements                      
future minimum rental income                      
Number of aircraft                 19    
CRJ 700 | American                      
future minimum rental income                      
Number of aircraft                 10    
Number of aircrafts to be placed in service 2               2    
CRJ 900 | Minimum                      
future minimum rental income                      
Number of seats on aircraft                 65    
CRJ 900 | Maximum                      
future minimum rental income                      
Number of seats on aircraft                 76    
CRJ 900 | Sky West Airlines Inc | Delta Connection Agreement                      
future minimum rental income                      
Number of aircraft                 43    
CRJ 900 | Delta                      
future minimum rental income                      
Number of aircraft                 1    
Agreement term                 9 years    
E175 | Minimum                      
future minimum rental income                      
Number of seats on aircraft                 65    
E175 | Maximum                      
future minimum rental income                      
Number of seats on aircraft                 76    
E175 | Alaska Capacity Purchase Agreement                      
future minimum rental income                      
Agreement term                 9 years 2 months 12 days    
E175 | Sky West Airlines Inc | Delta Connection Agreement                      
future minimum rental income                      
Number of aircraft                 59    
Number of additional aircraft placed into service                 6    
E175 | Sky West Airlines Inc | United Express Agreements                      
future minimum rental income                      
Number of aircraft                 65    
E175 | Sky West Airlines Inc | American Capacity Purchase Agreement                      
future minimum rental income                      
Number of additional aircraft placed into service                 20    
Flying agreements                      
Revenues [Abstract]                      
Operating revenues | $                 $ 2,889,265 3,169,520 3,078,297
Rental income under operating leases                      
Total operating revenues | $                 2,889,265 3,169,520 3,078,297
future minimum rental income                      
Accounts receivable | $ $ 58,800       $ 52,700       58,800 52,700  
Flight operations                      
Revenues [Abstract]                      
Operating revenues | $                 1,538,062 1,856,253 1,805,510
Aircraft lease                      
Revenues [Abstract]                      
Operating revenues | $                 830,247 814,518 834,366
Prorate agreements                      
Revenues [Abstract]                      
Operating revenues | $                 520,956 498,749 438,421
Airport customer service revenue                      
Revenues [Abstract]                      
Operating revenues | $                 45,538 48,236 41,002
Airport customer service and other                      
Rental income under operating leases                      
Total operating revenues | $                 $ 82,698 $ 52,159 $ 44,295