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Leases, Commitments and Contingencies - Commitments and Obligations (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Operating lease payments for aircraft and facility obligations |  |
Apr - Dec 2020 | $ 75,137 |
2021 | 85,409 |
2022 | 75,776 |
2023 | 69,623 |
2024 | 28,320 |
Thereafter | 100,234 |
Total | 434,499 |
Firm aircraft and spare engine commitments |  |
Apr - Dec 2020 | 435,183 |
2021 | 274,114 |
2022 | 5,500 |
Total | 714,797 |
Interest commitments |  |
Apr - Dec 2020 | 88,581 |
2021 | 104,678 |
2022 | 90,251 |
2023 | 73,946 |
2024 | 59,373 |
Thereafter | 126,324 |
Total | 543,153 |
Principal maturities on long-term debt |  |
Apr - Dec 2020 | 277,692 |
2021 | 352,005 |
2022 | 365,907 |
2023 | 374,906 |
2024 | 327,630 |
Thereafter | 1,229,122 |
Total long-term debt | 2,927,262 | $ 3,017,523
Total commitments and obligations |  |
Apr - Dec 2020 | 876,593 |
2021 | 816,206 |
2022 | 537,434 |
2023 | 518,475 |
2024 | 415,323 |
Thereafter | 1,455,680 |
Total | $ 4,619,711 |

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