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Flying Agreements Revenue and Lease, Airport Services and Other Revenues (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2022
USD ($)
aircraft
Mar. 31, 2021
USD ($)
Dec. 31, 2021
USD ($)
Agreements with other airlines      
Percentage of ASMs flown under fixed-fee arrangements 88.80% 86.60%  
Percentage of ASMs flown under pro-rate arrangements 11.20% 13.40%  
Rental income under operating leases      
Operating lease revenue $ 16,555 $ 14,950  
Total operating revenues 735,152 534,555  
Future minimum rental income      
April 2022 through December 2022 34,054    
2023 44,677    
2024 42,593    
2025 39,145    
2026 34,516    
Thereafter 120,636    
Total 315,621    
Deferred revenue recognized 7,500    
Unbilled revenue recognized 3,600    
Deferred revenue 96,400 21,200 $ 103,900
Deferred revenue in other current liabilities 33,000   24,500
Deferred revenue in other long-term liabilities 63,400   79,400
Property and equipment and related assets 5,528,821   5,498,599
Gross receivables current 89,400    
Gross receivables Non-current 232,100    
Credit loss reserve 42,100   42,000
Increase in credit loss reserves 100    
Other Noncurrent Assets      
Future minimum rental income      
Unbilled revenue $ 12,000   $ 8,400
Aircraft in schedule service or under contract      
Future minimum rental income      
Number of aircraft | aircraft 513    
United      
Future minimum rental income      
Number of aircraft | aircraft 220    
Delta      
Future minimum rental income      
Number of aircraft | aircraft 149    
American      
Future minimum rental income      
Number of aircraft | aircraft 108    
Jet aircraft and spare engines leased to third parties      
Future minimum rental income      
Property and equipment and related assets $ 246,900    
CRJ 200 | United | United Express Agreements      
Future minimum rental income      
Number of aircraft | aircraft 70    
CRJ 200 | United | United Express Prorate Agreement      
Future minimum rental income      
Number of aircraft | aircraft 41    
Agreement term 120 days    
CRJ 200 | Delta | Delta Capacity Purchase Agreement      
Future minimum rental income      
Number of aircraft | aircraft 9    
CRJ 200 | Delta | Delta Connection Prorate Agreement      
Future minimum rental income      
Number of aircraft | aircraft 20    
Agreement term 30 days    
CRJ 700 | United | United Express Agreements      
Future minimum rental income      
Number of aircraft | aircraft 19    
CRJ 700 | Delta | Delta Connection Agreements      
Future minimum rental income      
Number of aircraft | aircraft 5    
CRJ 700 | American      
Future minimum rental income      
Number of aircraft under purchase agreement | aircraft 11    
CRJ 700 | American | American Capacity Purchase Agreement      
Future minimum rental income      
Number of aircraft | aircraft 90    
CRJ 900 | Delta | Delta Connection Agreements      
Future minimum rental income      
Number of aircraft | aircraft 44    
E175      
Future minimum rental income      
Number of aircraft under purchase agreement | aircraft 25    
E175 | Sky West Airlines Inc. | Delta Capacity Purchase Agreement      
Future minimum rental income      
Number of aircraft under purchase agreement | aircraft 16    
Number of aircraft to be placed by 2022 | aircraft 16    
E175 | Sky West Airlines Inc. | Alaska Capacity Purchase Agreement      
Future minimum rental income      
Number of aircraft | aircraft 36    
Number of aircraft under purchase agreement | aircraft 7    
E175 | United | United Express Agreements      
Future minimum rental income      
Number of aircraft | aircraft 90    
E175 | Delta | Delta Connection Agreements      
Future minimum rental income      
Number of aircraft | aircraft 71    
E175 | American      
Future minimum rental income      
Number of aircraft under purchase agreement | aircraft 2    
E175 | American | American Capacity Purchase Agreement      
Future minimum rental income      
Number of aircraft | aircraft 18    
Flying agreements      
Rental income under operating leases      
Total operating revenues $ 708,063 511,191  
Flight operations      
Rental income under operating leases      
Total operating revenues 348,474 211,052  
Aircraft lease and fixed revenue      
Rental income under operating leases      
Total operating revenues 280,419 231,491  
Prorate agreements      
Rental income under operating leases      
Total operating revenues 79,170 68,648  
Airport customer service and other revenue      
Rental income under operating leases      
Total operating revenues 10,534 8,414  
Lease, airport services and other.      
Rental income under operating leases      
Total operating revenues $ 27,089 $ 23,364