Leases, Commitments and Contingencies - Commitments and Obligations (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Operating lease payments for aircraft and facility obligations
Jul - Dec 2020	$ 49,498
2021	85,084
2022	76,132
2023	69,394
2024	28,091
Thereafter	98,424
Total	406,623
Firm aircraft and spare engine commitments
Jul - Dec 2020	110,007
2021	159,719
2022	391,680
Total	661,406
Interest commitments
Jul - Dec 2020	81,103
2021	111,231
2022	96,260
2023	79,076
2024	63,594
Thereafter	139,405
Total	570,669
Principal maturities on long-term debt
Jul - Dec 2020	120,956
2021	388,638
2022	389,593
2023	399,472
2024	353,106
Thereafter	1,345,104
Total long-term debt	2,996,869	$ 3,017,523
Total commitments and obligations
Jul - Dec 2020	361,564
2021	744,672
2022	953,665
2023	547,942
2024	444,791
Thereafter	1,582,933
Total	$ 4,635,567

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Amount of lessee's undiscounted obligation for lease payments for operating lease.

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