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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 |

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