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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, 2020
USD ($)
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2020
USD ($)
aircraft
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Agreements with other airlines                      
Percentage of ASMs flown under fixed-fee arrangements                 87.00%    
Percentage of ASMs flown under pro-rate arrangements                 13.00%    
Revenues [Abstract]                      
Operating revenues $ 589,638 $ 457,493 $ 350,039 $ 729,936 $ 743,591 $ 760,295 $ 744,383 $ 723,694 $ 2,127,106 $ 2,971,963 $ 3,221,679
Rental income under operating leases                      
Operating lease revenue                 34,791    
Operating lease income relating to lease payments                   27,552 3,923
Operating lease income relating to variable lease payments                 5,710 9,608  
Future minimum rental income                      
2021 43,573               43,573    
2022 43,390               43,390    
2023 42,837               42,837    
2024 42,530               42,530    
2025 39,082               39,082    
Thereafter 155,089               155,089    
Total 366,501               366,501    
Property and equipment and related assets 5,362,048       5,394,681       5,362,048 5,394,681  
Deferred recognizing revenue                 110,728    
Accounts receivable 34,500       83,000       34,500 83,000  
Gross receivables current 56,100               56,100    
Gross receivables Non-current 157,400               157,400    
Balance       $ 15,388         15,388    
Additions to credit loss reserve                 30,837    
Balance 46,225       15,388       $ 46,225 15,388  
Sky West Airlines Inc | Delta Connection Agreement                      
Future minimum rental income                      
Agreement term                 5 years 8 months 12 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 10 months 24 days    
Sky West Airlines Inc | United Express 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 271,100               $ 271,100    
CRJ 200                      
Future minimum rental income                      
Number of seats on aircraft | aircraft                 50    
CRJ 200 | Sky West Airlines Inc | Delta Connection Prorate Agreement                      
Future minimum rental income                      
Number of aircraft | aircraft                 26    
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                 34    
CRJ 700 | Minimum                      
Future minimum rental income                      
Number of seats on aircraft | aircraft                 65    
CRJ 700 | Maximum                      
Future minimum rental income                      
Number of seats on aircraft | aircraft                 76    
CRJ 700 | American Capacity Purchase Agreement                      
Future minimum rental income                      
Number of aircraft | aircraft                 65    
Agreement term                 3 years 3 months 18 days    
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 700 | American                      
Future minimum rental income                      
Number of aircraft | aircraft                 25    
CRJ 900 | Minimum                      
Future minimum rental income                      
Number of seats on aircraft | aircraft                 65    
CRJ 900 | Maximum                      
Future minimum rental income                      
Number of seats on aircraft | aircraft                 76    
CRJ 900 | Sky West Airlines Inc | Delta Connection Agreement                      
Future minimum rental income                      
Number of aircraft | aircraft                 39    
CRJ 900 | Delta                      
Future minimum rental income                      
Number of aircraft | aircraft                 1    
E175 | Minimum                      
Future minimum rental income                      
Number of seats on aircraft | aircraft                 65    
E175 | Maximum                      
Future minimum rental income                      
Number of seats on aircraft | aircraft                 76    
E175 | Alaska Capacity Purchase Agreement                      
Future minimum rental income                      
Number of aircraft | aircraft                 32    
Agreement term                 8 years 2 months 12 days    
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 | American                      
Future minimum rental income                      
Number of aircraft | aircraft                 20    
Flying agreements                      
Revenues [Abstract]                      
Operating revenues                 $ 2,060,801 2,889,265 3,169,520
Future minimum rental income                      
Accounts receivable $ 27,500       $ 58,800       27,500 58,800  
Flight operations                      
Revenues [Abstract]                      
Operating revenues                 945,008 1,538,062 1,856,253
Aircraft lease and fixed revenue                      
Revenues [Abstract]                      
Operating revenues                 846,933 830,247 814,518
Prorate agreements                      
Revenues [Abstract]                      
Operating revenues                 268,860 520,956 498,749
Airport customer service and other revenue                      
Rental income under operating leases                      
Operating lease revenue                 25,804 45,538 48,236
Lease, airport services and other                      
Rental income under operating leases                      
Total operating lease income                 $ 66,305 $ 82,698 $ 52,159