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Accrued maintenance liability | 6 Months Ended
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Jun. 30, 2021
Accrued Maintenance Liability [Abstract] |
Accrued maintenance liability | Accrued maintenance liability Movements in accrued maintenance liability during the six months ended June 30, 2021 and 2020 were as follows:
| Six Months Ended June 30,
| 2021 |  | 2020
Accrued maintenance liability at beginning of period | $ | 1,750,395 |  |  | $ | 2,190,159 |
Maintenance payments received | 163,280 |  |  | 194,779 |
Maintenance payments returned | (91,957) |  |  | (208,630) |
Release to income upon sale | (13,587) |  |  | (86,592) |
Release to income other than upon sale | (140,047) |  |  | (224,207) |
Lessor contribution, top-ups and other | (19,887) |  |  | 65,365 |
Accrued maintenance liability at end of period | $ | 1,648,197 |  |  | $ | 1,930,874 |

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