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Operating Revenues (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
Jun. 30, 2024
USD ($)
aircraft
Jun. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
Agreements with other airlines          
Percentage of ASMs flown under fixed-fee arrangements     87.10% 88.30%  
EAS contract term     2 years    
Percentage of ASMs flown under pro-rate arrangements     12.90% 11.70%  
Rental income under operating leases          
Operating lease revenue $ 22,116 $ 16,791 $ 38,784 $ 33,351  
Total operating revenues 867,118 725,643 1,670,732 1,417,474  
Future minimum rental income          
July 2024 through December 2024 23,417   23,417    
2025 42,017   42,017    
2026 36,410   36,410    
2027 36,395   36,395    
2028 35,508   35,508    
Thereafter 54,377   54,377    
Total future minimum rental income under operating leases 228,124   228,124    
Deferred revenue recognized     6,000 77,400  
Decreased unbilled revenue     600 6,000  
Deferred revenue 367,600   367,600   $ 374,600
Deferred revenue in other current liabilities 64,200   64,200   61,000
Deferred revenue in other long-term liabilities 303,400   303,400   313,600
Unbilled revenue 6,700   6,700   7,300
Property and equipment and related assets 5,434,750   5,434,750   5,482,967
Gross receivables current 106,900   106,900    
Gross receivables Non-current 206,000   206,000    
Balance     18,699    
Adjustments to credit loss reserves     974    
Balance 19,673   19,673    
Other Current Assets          
Future minimum rental income          
Unbilled revenue 1,100   1,100   1,200
Other Noncurrent Assets          
Future minimum rental income          
Unbilled revenue 5,600   5,600   $ 6,100
Other Noncurrent Liabilities          
Future minimum rental income          
Deferred lease revenue 1,000 40,000 $ 1,000 40,000  
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     9    
United          
Future minimum rental income          
Number of aircraft | aircraft     207    
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     91    
Jet aircraft and spare engines leased to third parties          
Future minimum rental income          
Property and equipment and related assets 207,600   $ 207,600    
CRJ 200 | United | United Express Agreements          
Future minimum rental income          
Number of aircraft | aircraft     68    
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     71    
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     14    
2025 | aircraft     8    
2026 | aircraft     8    
Total | aircraft     30    
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     13    
2025 | aircraft     7    
2026 | aircraft     8    
Total | aircraft     28    
Number of aircraft | aircraft     101    
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 838,170 700,394 $ 1,616,459 1,364,232  
Flight operations revenue          
Rental income under operating leases          
Total operating revenues 595,127 499,142 1,139,287 968,058  
Capacity purchase agreements fixed aircraft lease revenue          
Rental income under operating leases          
Total operating revenues 75,131 74,042 150,290 148,522  
Capacity purchase agreements variable aircraft lease revenue          
Rental income under operating leases          
Total operating revenues 60,841 44,984 118,727 88,089  
Prorate agreements and SWC revenue          
Rental income under operating leases          
Total operating revenues 107,071 82,226 208,155 159,563  
Airport customer service and other revenue          
Rental income under operating leases          
Total operating revenues 6,832 8,458 15,489 19,891  
Lease, airport services and other.          
Rental income under operating leases          
Total operating revenues $ 28,948 $ 25,249 $ 54,273 $ 53,242