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Commitments and Contingencies (Tables) | 6 Months Ended
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Jun. 30, 2018
Commitments and Contingencies |
Schedule of Future Minimum Rental Payments for Operating Leases | The following table summarizes future minimum rental payments primarily related to aircraft required under operating leases that had initial or remaining non-cancelable lease terms as of June 30, 2018 (in thousands):
July through December 2018 |  | $ | 43,683 |
2019 |  |  | 85,317 |
2020 |  |  | 101,529 |
2021 |  |  | 93,117 |
2022 |  |  | 75,178 |
Thereafter |  |  | 159,347 |
|  | $ | 558,171 |
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 2018 |  | 2019 |  | 2020 |  | 2021 |  | 2022 |  | Thereafter |
Operating lease payments for aircraft and facility obligations |  | $ | 558,171 |  | $ | 43,683 |  | $ | 85,317 |  | $ | 101,529 |  | $ | 93,117 |  | $ | 75,178 |  | $ | 159,347 |
Firm aircraft and spare engine commitments |  |  | 626,980 |  |  | 508,740 |  |  | 21,200 |  |  | 10,600 |  |  | 86,440 |  |  | — |  |  | — |
Interest commitments (1) |  |  | 600,413 |  |  | 60,497 |  |  | 111,075 |  |  | 96,051 |  |  | 82,139 |  |  | 69,227 |  |  | 181,424 |
Principal maturities on long-term debt |  |  | 2,994,776 |  |  | 172,320 |  |  | 357,548 |  |  | 330,229 |  |  | 319,827 |  |  | 310,891 |  |  | 1,503,961 |
Total commitments and obligations |  | $ | 4,780,340 |  | $ | 785,240 |  | $ | 575,140 |  | $ | 538,409 |  | $ | 581,523 |  | $ | 455,296 |  | $ | 1,844,732 |
| (1) |  | At June 30, 2018, the Company had variable rate notes representing 1.6% of its total long-term debt. Actual interest commitments will change based on the actual variable interest.

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- Definition Tabular disclosure of the aggregate amount of payments due on known contractual obligations for the five years following the date of the latest balance sheet and the combined aggregate amount of maturities of known contractual obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 303 -Paragraph a -Subparagraph 5 + Details
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- Definition Tabular disclosure of future minimum payments required in the aggregate and for each of the five succeeding fiscal years for operating leases having initial or remaining noncancelable lease terms in excess of one year and the total minimum rentals to be received in the future under noncancelable subleases as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 + Details
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