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Leases, Commitments and Contingencies (Tables) | 6 Months Ended
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Jun. 30, 2019
Summary of related terms and discount rates | ​
​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​
​ ​ | June 30, 2019
Weighted-average remaining lease term |  | ​ |
Operating leases | ​ | ​ | 6.5 years | ​
Weighted-average discount rate | ​ |  | ​ | ​
Operating leases | ​ | ​ | 6.4% | ​
Summary of lease costs | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the three months ended June 30,
​ |  | 2019 |  | 2018
Operating lease cost |  | $ | 27,647 |  | $ | 45,425
Variable and short-term lease cost | ​ |  | 1,346 | ​ |  | 1,392
Total lease cost |  | $ | 28,993 |  | $ | 46,817
​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the six months ended June 30,
​ |  | 2019 |  | 2018
Operating lease cost |  | $ | 54,868 |  | $ | 98,258
Variable and short-term lease cost | ​ |  | 2,821 | ​ |  | 2,811
Total lease cost |  | $ | 57,689 |  | $ | 101,069
​ ​
Schedule of future minimum rental payments for operating leases | ​
​ | ​ | ​ | ​ | ​
July 2019 through December 2019 |  | $ | 36,756 |
2020 | ​ |  | 93,752 | ​
2021 | ​ |  | 76,687 | ​
2022 | ​ |  | 67,728 | ​
2023 | ​ |  | 62,558 | ​
Thereafter | ​ |  | 88,144 | ​
​ | ​ | $ | 425,625 | ​
Summary of commitments and obligations | The following table summarizes the Company’s commitments and obligations as noted for each of the next five years and thereafter (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Total |  | Jul - Dec 2019 |  | 2020 |  | 2021 |  | 2022 |  | 2023 |  | Thereafter |
Operating lease payments for aircraft and facility obligations | ​ | $ | 425,625 | ​ | $ | 36,756 | ​ | $ | 93,752 | ​ | $ | 76,687 | ​ | $ | 67,728 | ​ | $ | 62,558 | ​ | $ | 88,144 |
Firm aircraft and spare engine commitments |  | ​ | 313,466 | ​ | ​ | 79,428 | ​ | ​ | 136,598 | ​ | ​ | 97,440 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​
Interest commitments (1) |  | ​ | 615,318 | ​ | ​ | 63,949 | ​ | ​ | 116,723 | ​ | ​ | 101,295 | ​ | ​ | 87,294 | ​ | ​ | 71,252 | ​ | ​ | 174,805 | ​
Principal maturities on long-term debt |  | ​ | 3,088,639 | ​ | ​ | 171,243 | ​ | ​ | 361,481 | ​ | ​ | 344,587 | ​ | ​ | 358,586 | ​ | ​ | 367,322 | ​ | ​ | 1,485,420 | ​
Total commitments and obligations | ​ | $ | 4,443,048 | ​ | $ | 351,376 | ​ | $ | 708,554 | ​ | $ | 620,009 | ​ | $ | 513,608 | ​ | $ | 501,132 | ​ | $ | 1,748,369 | ​
​
(1) | At June 30, 2019, the Company had variable rate notes representing only 0.1% of its total long-term debt.
Previously reported |
Schedule of future minimum rental payments for operating leases | The following table summarizes future minimum rental payments required under operating leases that have non-cancelable lease terms in excess of one year as of December 31, 2018 (in thousands):

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