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Operating Revenues (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2025
USD ($)
aircraft
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
aircraft
item
Sep. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
Agreements with other airlines          
Percentage of ASMs flown under fixed-fee arrangements     84.80% 86.80%  
Percentage of ASMs flown under pro-rate arrangements     15.20% 13.20%  
Rental income under operating leases          
Operating lease fixed revenue $ 16,267 $ 14,880 $ 49,029 $ 40,550  
Operating lease variable revenue 9,139 7,254 24,674 20,368  
Total operating revenues 1,050,029 912,786 3,033,711 2,583,518  
Future minimum rental income          
October 2025 through December 2025 12,839   12,839    
2026 44,879   44,879    
2027 41,565   41,565    
2028 40,687   40,687    
2029 39,164   39,164    
Thereafter 24,180   24,180    
Total future minimum rental income under operating leases 203,314   203,314    
Deferred revenue recognized     28,800 24,500  
Increase (decrease) in unbilled revenue     9,500 (900)  
Increase (decrease) in unbilled lease revenue     4,200    
Deferred revenue 297,100   297,100   $ 337,500
Deferred revenue in other current liabilities 133,800   133,800   54,800
Deferred revenue in other long-term liabilities 163,300   163,300   282,700
Unbilled revenue 27,700   27,700   15,100
Property and equipment and related assets 5,662,390   5,662,390   5,587,408
Gross receivables current 149,500   149,500   125,900
Gross receivables Non-current 257,800   257,800   225,200
Balance     15,071    
Adjustments to credit loss reserves     6,750    
Write-offs charged against allowance     (82)    
Balance 21,739   21,739    
Other Current Assets          
Future minimum rental income          
Unbilled revenue 1,100   1,100   1,100
Other Noncurrent Assets          
Future minimum rental income          
Unbilled revenue 26,600   26,600   $ 14,000
Other Noncurrent Liabilities          
Future minimum rental income          
Deferred lease revenue $ 10,500 1,500 $ 10,500 1,500  
Minimum          
Agreements with other airlines          
EAS contract term     2 years    
Maximum          
Agreements with other airlines          
EAS contract term     3 years    
Aircraft in schedule service or under contract          
Future minimum rental income          
Number of aircraft | aircraft     498    
Aircraft          
Future minimum rental income          
Number of aircraft subleased | aircraft 8   8    
United          
Future minimum rental income          
Number of aircraft | aircraft     223    
United | United Express Prorate Agreement          
Future minimum rental income          
Agreement term     120 days    
Delta          
Future minimum rental income          
Number of aircraft | aircraft     141    
Delta | Delta Connection Prorate Agreement          
Future minimum rental income          
Agreement term     30 days    
American          
Future minimum rental income          
Number of aircraft | aircraft     92    
American | American Prorate Agreement          
Future minimum rental income          
Agreement term     180 days    
Jet aircraft and spare engines leased to third parties          
Future minimum rental income          
Property and equipment and related assets $ 241,700   $ 241,700    
CRJ 200 | United | United Express Agreements          
Future minimum rental income          
Number of aircraft | aircraft     42    
CRJ 200 | United | United Express Prorate Agreement          
Future minimum rental income          
Number of aircraft | aircraft     31    
CRJ 550 | United Express Agreements          
Future minimum rental income          
Number of new aircraft ordered | aircraft 29   29    
CRJ 550 | Delta | Delta Connection Prorate Agreement          
Future minimum rental income          
Number of aircraft | aircraft     15    
CRJ 700          
Future minimum rental income          
Number of seats on aircraft | item     50    
CRJ 700 | United | United Express Agreements          
Future minimum rental income          
Number of aircraft | aircraft     34    
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 | aircraft     68    
CRJ 900 | Delta | Delta Connection Agreements          
Future minimum rental income          
Number of aircraft | aircraft     34    
CRJ 900 | American | American Prorate Agreement          
Future minimum rental income          
Number of aircraft | aircraft     4    
E175          
Future minimum rental income          
Number of aircraft under purchase agreement | aircraft     74    
E175 | United Express Agreements          
Future minimum rental income          
Number of new aircraft ordered | aircraft 13   13    
Number of aircraft scheduled for delivery in 2025 | aircraft 3   3    
Number of aircraft scheduled for delivery in 2026 | aircraft 10   10    
E175 | Delta Connection Agreements          
Future minimum rental income          
Number of new aircraft ordered | aircraft 16   16    
Number of aircraft delivered in year three | aircraft 10   10    
Number of aircraft delivered in year four | aircraft 6   6    
E175 | Alaska Capacity Purchase Agreement          
Future minimum rental income          
Number of new aircraft ordered | aircraft 1   1    
E175 | United | United Express Agreements          
Future minimum rental income          
Number of aircraft | aircraft     116    
E175 | Delta | Delta Connection Agreements          
Future minimum rental income          
Number of aircraft | aircraft     87    
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          
Number of aircraft | aircraft     42    
Flying agreements          
Rental income under operating leases          
Total operating revenues $ 1,011,284 883,494 $ 2,914,789 2,499,953  
Flight operations revenue          
Rental income under operating leases          
Total operating revenues 672,559 624,342 1,994,660 1,763,629  
Capacity purchase agreements fixed aircraft lease revenue          
Rental income under operating leases          
Total operating revenues 91,036 75,084 306,244 225,374  
Capacity purchase agreements variable aircraft lease revenue          
Rental income under operating leases          
Total operating revenues 80,600 61,308 170,537 180,035  
Prorate agreements and SWC revenue          
Rental income under operating leases          
Total operating revenues 167,089 122,760 443,348 330,915  
Airport customer service and other revenue          
Rental income under operating leases          
Total operating revenues 13,339 7,158 45,219 22,647  
Lease, airport services and other.          
Rental income under operating leases          
Total operating revenues $ 38,745 $ 29,292 $ 118,922 $ 83,565