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Leases, Commitments and Contingencies - Commitments and Obligations (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Operating lease payments for aircraft and facility obligations    
Jul - Dec 2021 $ 45,463  
2022 79,858  
2023 73,192  
2024 29,954  
2025 17,354  
Thereafter 83,918  
Total 329,739  
Firm aircraft and spare engine commitments    
Jul - Dec 2021 482,500  
2022 276,398  
2023 32,410  
Total 791,308  
Interest commitments    
Jul - Dec 2021 58,414  
2022 106,040  
2023 88,289  
2024 72,111  
2025 57,377  
Thereafter 111,181  
Total 493,412  
Principal maturities on long-term debt    
Jul - Dec 2021 180,380  
2022 407,082  
2023 417,575  
2024 371,850  
2025 386,779  
Thereafter 1,281,967  
Total long-term debt 3,045,633 $ 3,236,002
Total commitments and obligations    
Jul - Dec 2021 766,757  
2022 869,378  
2023 611,466  
2024 473,915  
2025 461,510  
Thereafter 1,477,066  
Total $ 4,660,092