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Commitments and contingencies (Tables) | 12 Months Ended
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Dec. 31, 2019
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, 2019 and 2018 were as follows:
| Year Ended December 31,
| 2019 |  | 2018
Prepayments on flight equipment at beginning of period | $ | 3,024,520 |  |  | $ | 2,930,303 |
Prepayments made during the period | 1,329,110 |  |  | 1,811,917 |
Interest paid and capitalized during the period | 97,327 |  |  | 101,755 |
Prepayments and capitalized interest applied to the purchase of flight equipment | (1,496,479 | ) |  | (1,819,455 | )
Prepayments on flight equipment at end of period | $ | 2,954,478 |  |  | $ | 3,024,520 |
Schedule of unrecorded contractual commitments for purchase of fight equipment | The following table presents our contractual commitments for the purchase of flight equipment as of December 31, 2019, as adjusted to reflect the developments described in footnotes (a) and (b) below:
| 2020 |  | 2021 |  | 2022 |  | 2023 |  | 2024 |  | Thereafter |  | Total
Purchase obligations (a) (b) | $ | 3,470,502 |  |  | $ | 4,351,839 |  |  | $ | 2,992,145 |  |  | $ | 2,651,197 |  |  | $ | 1,807,081 |  |  | $ | 1,270,782 |  |  | $ | 16,543,546 |
(a) | As of December 31, 2019, we had commitments to purchase 297 aircraft and two purchase and leaseback transactions. In February 2020, we exercised an option to purchase an additional 50 Airbus A320neo Family aircraft from Airbus, with deliveries beginning in 2024. These commitments are included in the table above. The timing of payments is based on our estimates of expected delivery dates.
(b) In February 2020, we entered into an agreement with Boeing to reschedule the delivery positions of a portion of our Boeing 737 MAX aircraft on order to later dates. These revised delivery positions are reflected in the table above. 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 when the Boeing 737 MAX returns to service and 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 obligations that are not recognized as a liability on the balance sheet, including the nature and significant terms of an unconditional purchase obligation; the amount of the fixed and determinable portion of the obligation as of the date of the latest balance sheet presented in the aggregate and, if determinable, for each of the five succeeding fiscal years; the nature of any variable components of the obligation; the amount purchased under the obligation (for example, the take-or-pay or throughput contract) for the reporting period; and may include the amount of imputed interest necessary to reduce the obligation to present value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=77896938&loc=d3e25336-109308 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=77896938&loc=d3e25287-109308 + Details
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