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Leases, Commitments, Guarantees and Contingencies (Tables) | 3 Months Ended
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Mar. 31, 2024
Leases, Commitments, Guarantees and Contingencies |
Summary of related terms and discount rates | ​
​ | ​
​ | ​
Weighted-average remaining lease term for operating leases | 11.4 years
Weighted-average discount rate for operating leases | 6.2%
Summary of lease costs | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the three months ended March 31,
​ |  | 2024 |  | 2023
Operating lease cost | ​ | $ | 7,259 | ​ | $ | 24,948
Variable and short-term lease cost | ​ |  | 1,033 | ​ |  | 803
Sublease income | ​ | ​ | (1,246) | ​ | ​ | (1,350)
Total lease cost | ​ | $ | 7,046 | ​ | $ | 24,401
Schedule of future minimum rental income under operating leases | ​
​ | ​ | ​ | ​
April 2024 through December 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
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 |  | Apr - Dec 2024 |  | 2025 |  | 2026 |  | 2027 |  | 2028 |  | Thereafter
Operating lease payments for aircraft and facility obligations | ​ | $ | 128,161 | ​ | $ | 15,726 | ​ | $ | 17,974 | ​ | $ | 14,910 | ​ | $ | 12,983 | ​ | $ | 9,976 | ​ | $ | 56,592
Firm aircraft and spare engine commitments |  | ​ | 610,945 | ​ | ​ | 143,810 | ​ | ​ | 230,725 | ​ | ​ | 236,410 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Interest commitments (1) |  | ​ | 442,822 | ​ | ​ | 84,964 | ​ | ​ | 97,933 | ​ | ​ | 78,149 | ​ | ​ | 56,289 | ​ | ​ | 40,947 | ​ | ​ | 84,540
Principal maturities on long-term debt |  | ​ | 2,918,971 | ​ | ​ | 339,156 | ​ | ​ | 532,255 | ​ | ​ | 510,598 | ​ | ​ | 464,289 | ​ | ​ | 292,862 | ​ | ​ | 779,811
Total commitments and obligations | ​ | $ | 4,100,899 | ​ | $ | 583,656 | ​ | $ | 878,887 | ​ | $ | 840,067 | ​ | $ | 533,561 | ​ | $ | 343,785 | ​ | $ | 920,943
(1) | At March 31, 2024, the Company’s long-term debt had fixed interest rates.

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- Definition Tabular disclosure of contractual obligation by timing of payment due. Includes, but is not limited to, long-term debt obligation, lease obligation, and purchase obligation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (S-X 210.12-04) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480678/235-10-S99-3 + Details
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- Definition Tabular disclosure of lessee's lease cost. Includes, but is not limited to, interest expense for finance lease, amortization of right-of-use asset for finance lease, operating lease cost, short-term lease cost, variable lease cost and sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-4 + Details
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