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Operating Revenues (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2024
USD ($)
aircraft
Mar. 31, 2023
USD ($)
Dec. 31, 2023
USD ($)
Agreements with other airlines      
Percentage of ASMs flown under fixed-fee arrangements 87.00% 88.40%  
EAS contract term 2 years    
Percentage of ASMs flown under pro-rate arrangements 13.00% 11.60%  
Rental income under operating leases      
Operating lease revenue $ 16,668 $ 16,560  
Total operating revenues 803,614 691,831  
Future minimum rental income      
April 2024 through December 2024 34,787    
2025 41,476    
2026 35,946    
2027 35,915    
2028 35,139    
Thereafter 53,500    
Total future minimum rental income under operating leases 236,763    
Deferred revenue recognized 700 39,300  
Decreased unbilled revenue 300 3,300  
Deferred revenue 373,400   $ 374,600
Deferred revenue in other current liabilities 58,000   61,000
Deferred revenue in other long-term liabilities 315,400   313,600
Unbilled revenue 7,000   7,300
Property and equipment and related assets 5,490,819   5,482,967
Gross receivables current 89,500    
Gross receivables Non-current 203,900    
Balance 18,699    
Adjustments to credit loss reserves 943    
Balance 19,642    
Other Current Assets      
Future minimum rental income      
Unbilled revenue 1,100   1,200
Other Noncurrent Assets      
Future minimum rental income      
Unbilled revenue 5,900   $ 6,100
Other Noncurrent Liabilities      
Future minimum rental income      
Deferred lease revenue $ 500 20,600  
Aircraft in schedule service or under contract      
Future minimum rental income      
Number of aircraft | aircraft 475    
Sky West Airlines Inc.      
Future minimum rental income      
2024 | aircraft 17    
United      
Future minimum rental income      
Number of aircraft | aircraft 201    
United | United Express Prorate Agreement      
Future minimum rental income      
Agreement term 120 days    
Delta      
Future minimum rental income      
Number of aircraft | aircraft 135    
Delta | Delta Connection Prorate Agreement      
Future minimum rental income      
Agreement term 30 days    
American      
Future minimum rental income      
Number of aircraft | aircraft 97    
Jet aircraft and spare engines leased to third parties      
Future minimum rental income      
Property and equipment and related assets $ 210,400    
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 19    
CRJ 700 | United | United Express Agreements      
Future minimum rental income      
Number of aircraft | aircraft 19    
CRJ 700 | Delta | Delta Connection Prorate Agreement      
Future minimum rental income      
Number of aircraft | aircraft 4    
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 77    
CRJ 900 | Delta | Delta Connection Prorate Agreement      
Future minimum rental income      
Number of aircraft | aircraft 6    
CRJ 900 | Delta | Delta Connection Agreements      
Future minimum rental income      
Number of aircraft | aircraft 35    
E175      
Future minimum rental income      
2024 | aircraft 22    
2025 | aircraft 8    
2026 | aircraft 8    
Total | aircraft 38    
Number of aircraft under purchase agreement | aircraft 21    
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      
2024 | aircraft 21    
2025 | aircraft 7    
2026 | aircraft 8    
Total | aircraft 36    
Number of aircraft | aircraft 93    
E175 | Delta | Delta Capacity Purchase Agreement      
Future minimum rental income      
2024 | aircraft 1    
Total | aircraft 1    
E175 | Delta | Delta Connection Agreements      
Future minimum rental income      
Number of aircraft | aircraft 85    
E175 | American | American Capacity Purchase Agreement      
Future minimum rental income      
Number of aircraft | aircraft 20    
E175 | Alaska | Alaska Capacity Purchase Agreement      
Future minimum rental income      
2025 | aircraft 1    
Total | aircraft 1    
Flying agreements      
Rental income under operating leases      
Total operating revenues $ 778,289 663,838  
Flight operations revenue      
Rental income under operating leases      
Total operating revenues 544,160 468,916  
Capacity purchase agreements fixed aircraft lease revenue      
Rental income under operating leases      
Total operating revenues 75,159 74,480  
Capacity purchase agreements variable aircraft lease revenue      
Rental income under operating leases      
Total operating revenues 57,886 43,105  
Prorate agreements and SWC revenue      
Rental income under operating leases      
Total operating revenues 101,084 77,337  
Airport customer service and other revenue      
Rental income under operating leases      
Total operating revenues 8,657 11,433  
Lease, airport services and other.      
Rental income under operating leases      
Total operating revenues $ 25,325 $ 27,993