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Leases, Commitments and Contingencies - Commitments and Obligations (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Operating lease payments for aircraft and facility obligations    
Oct - Dec 2021 $ 22,346  
2022 80,467  
2023 74,119  
2024 30,426  
2025 17,824  
Thereafter 84,253  
Total 309,435  
Firm aircraft and spare engine commitments    
Oct - Dec 2021 327,446  
2022 708,909  
2023 26,480  
Total 1,062,834  
Interest commitments    
Oct - Dec 2021 28,177  
2022 106,024  
2023 90,452  
2024 74,768  
2025 59,766  
Thereafter 120,928  
Total 480,115  
Principal maturities on long-term debt    
Oct - Dec 2021 92,341  
2022 378,855  
2023 386,035  
2024 380,475  
2025 395,673  
Thereafter 1,363,194  
Total long-term debt 2,996,573 $ 3,236,002
Total commitments and obligations    
Oct - Dec 2021 470,310  
2022 1,274,255  
2023 577,086  
2024 485,669  
2025 473,263  
Thereafter 1,568,375  
Total $ 4,848,958