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Commitments and contingencies (Tables) | 12 Months Ended
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Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract] |
Schedule of movements in prepayments on flight equipment | Movements in prepayments on flight equipment during the years ended December 31, 2020 and 2019 were as follows:
| Year Ended December 31,
| 2020 |  | 2019
Prepayments on flight equipment at beginning of period | $ | 2,954,478 |  |  | $ | 3,024,520 |
Prepayments made during the period, net | 270,032 |  |  | 1,329,110 |
Interest paid and capitalized during the period | 49,144 |  |  | 97,327 |
Prepayments and capitalized interest applied to the purchase of flight equipment | (1,161,995) |  |  | (1,496,479) |
Prepayments on flight equipment at end of period | $ | 2,111,659 |  |  | $ | 2,954,478 |
Schedule of unrecorded contractual commitments for purchase of flight equipment | The following table presents our contractual commitments for the purchase of flight equipment as of December 31, 2020:
| 2021 |  | 2022 |  | 2023 |  | 2024 |  | 2025 |  | Thereafter |  | Total
Purchase obligations (a) (b) | $ | 1,511,360 |  |  | $ | 2,519,296 |  |  | $ | 3,099,701 |  |  | $ | 2,962,120 |  |  | $ | 2,525,185 |  |  | $ | 1,508,043 |  |  | $ | 14,125,705 |
(a)As of December 31, 2020, we had commitments to purchase 284 aircraft and two purchase and leaseback transactions. The timing of our purchase obligations is based on current estimates. Due to the current Covid-19 pandemic, we expect that the delivery of many of our aircraft on order will be delayed to future periods. We have incorporated expected delivery delays into the table above. In addition, we have the right to reschedule the delivery dates of certain of our aircraft to future dates. (b)The delivery positions of our Boeing 737 MAX aircraft are based on our best estimates and incorporate the information currently available to us. Our estimates may be different from the actual delivery dates, and will depend on the speed at which Boeing is able to deliver our aircraft on order to us.

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- Definition Tabular disclosure of unconditional purchase obligation not recognized as liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121559207&loc=d3e25336-109308 + Details
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