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Leases, Commitments, Guarantees and Contingencies - Commitments and Obligations (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Operating lease payments for aircraft and facility obligations    
Apr - Dec 2024 $ 15,726  
2025 17,974  
2026 14,910  
2027 12,983  
2028 9,976  
Thereafter 56,592  
Total future minimum operating lease payments 128,161  
Firm aircraft and spare engine commitments    
Apr - Dec 2024 143,810  
2025 230,725  
2026 236,410  
Total 610,945  
Interest commitments    
Apr - Dec 2024 84,964  
2025 97,933  
2026 78,149  
2027 56,289  
2028 40,947  
Thereafter 84,540  
Total 442,822  
Principal maturities on long-term debt    
Apr - Dec 2024 339,156  
2025 532,255  
2026 510,598  
2027 464,289  
2028 292,862  
Thereafter 779,811  
Total 2,918,971 $ 3,030,310
Total commitments and obligations    
Apr - Dec 2024 583,656  
2025 878,887  
2026 840,067  
2027 533,561  
2028 343,785  
Thereafter 920,943  
Total $ 4,100,899