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Commitments and contingencies (Tables) | 6 Months Ended
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Jun. 30, 2019
Commitments and Contingencies Disclosure [Abstract] |
Schedule of movements in prepayments on flight equipment | Movements in prepayments on flight equipment during the six months ended June 30, 2019 and 2018 were as follows:
| Six Months Ended June 30,
| 2019 |  | 2018
Prepayments on flight equipment at beginning of period | $ | 3,024,520 |  |  | $ | 2,930,303 |
Prepayments during the period | 522,887 |  |  | 828,244 |
Interest paid and capitalized during the period | 53,905 |  |  | 46,582 |
Prepayments and capitalized interest applied to the purchase of flight equipment | (639,945 | ) |  | (642,443 | )
Prepayments on flight equipment at end of period | $ | 2,961,367 |  |  | $ | 3,162,686 |

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