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Flying Agreements Revenue and Lease, Airport Services and Other Revenues (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2023
USD ($)
aircraft
Mar. 31, 2022
USD ($)
Dec. 31, 2022
USD ($)
Agreements with other airlines      
Percentage of ASMs flown under fixed-fee arrangements 88.40% 88.80%  
Percentage of ASMs flown under pro-rate arrangements 11.60% 11.20%  
Rental income under operating leases      
Operating lease revenue relating to lease payments $ 16,560 $ 16,555  
Total operating revenues 691,831 735,152  
Future minimum rental income      
April 2023 through December 2023 34,183    
2024 45,441    
2025 40,470    
2026 34,904    
2027 34,882    
Thereafter 86,244    
Total 276,124    
Deferred revenue recognized 39,300 7,500  
Unbilled revenue recognized 3,300 3,600  
Deferred revenue 204,600   $ 144,700
Deferred revenue in other current liabilities 5,600   5,200
Deferred revenue in other long-term liabilities 199,000   139,500
Unbilled revenue 16,600   19,900
Property and equipment and related assets 5,561,458   5,548,480
Gross receivables current 120,000    
Gross receivables Non-current 195,500    
Balance 37,385    
Adjustments to credit loss reserves (631)    
Write-offs charged against allowance (3,570)    
Balance 33,184    
Other Current Assets      
Future minimum rental income      
Unbilled revenue 7,100   9,900
Other Noncurrent Assets      
Future minimum rental income      
Unbilled revenue 9,500   $ 10,000
Other Noncurrent Liabilities      
Future minimum rental income      
Deferred lease revenue $ 20,600    
Aircraft in schedule service or under contract      
Future minimum rental income      
Number of aircraft | aircraft 491    
United      
Future minimum rental income      
Number of aircraft | aircraft 204    
United | United Express Prorate Agreement      
Future minimum rental income      
Agreement term 120 days    
Delta      
Future minimum rental income      
Number of aircraft | aircraft 146    
Delta | Delta Connection Prorate Agreement      
Future minimum rental income      
Agreement term 30 days    
American      
Future minimum rental income      
Number of aircraft | aircraft 99    
Jet aircraft and spare engines leased to third parties      
Future minimum rental income      
Property and equipment and related assets $ 216,800    
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 25    
CRJ 200 | Delta | Delta Connection Prorate Agreement      
Future minimum rental income      
Number of aircraft | aircraft 21    
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 | American Capacity Purchase Agreement      
Future minimum rental income      
Number of aircraft | aircraft 79    
CRJ 900 | Delta | Delta Connection Prorate Agreement      
Future minimum rental income      
Number of aircraft | aircraft 1    
CRJ 900 | Delta | Delta Connection Agreements      
Future minimum rental income      
Number of aircraft | aircraft 35    
E175      
Future minimum rental income      
Number of aircraft under purchase agreement | aircraft 4    
E175 | Sky West Airlines Inc. | Alaska Capacity Purchase Agreement      
Future minimum rental income      
Number of aircraft | aircraft 42    
E175 | United | United Express Agreements      
Future minimum rental income      
Number of aircraft | aircraft 90    
E175 | Delta      
Future minimum rental income      
Number of aircraft under purchase agreement | aircraft 3    
E175 | Delta | Delta Connection Agreements      
Future minimum rental income      
Number of aircraft | aircraft 84    
E175 | American | American Capacity Purchase Agreement      
Future minimum rental income      
Number of aircraft | aircraft 20    
E175 | Alaska      
Future minimum rental income      
Number of aircraft under purchase agreement | aircraft 1    
Flying agreements      
Rental income under operating leases      
Total operating revenues $ 663,838 708,063  
Flight operations revenue      
Rental income under operating leases      
Total operating revenues 468,916 504,808  
Capacity purchase agreements fixed aircraft lease revenue      
Rental income under operating leases      
Total operating revenues 74,480 124,085  
Capacity purchase agreements variable aircraft lease revenue      
Rental income under operating leases      
Total operating revenues 43,105    
Prorate agreements revenue      
Rental income under operating leases      
Total operating revenues 77,337 79,170  
Airport customer service and other revenue      
Rental income under operating leases      
Total operating revenues 11,433 10,534  
Lease, airport services and other.      
Rental income under operating leases      
Total operating revenues $ 27,993 $ 27,089