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Accrued maintenance liability | 6 Months Ended
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Jun. 30, 2023
Accrued Maintenance Liability [Abstract] |
Accrued maintenance liability | Accrued maintenance liability Movements in accrued maintenance liability during the six months ended June 30, 2023 and 2022 were as follows:
| Six Months Ended June 30, |
| 2023 |  | 2022 |
Accrued maintenance liability at beginning of period | $ | 2,503,202 |  |  | $ | 2,900,651 |  |
Maintenance payments received | 378,292 |  |  | 353,522 |  |
Maintenance payments returned | (109,522) |  |  | (172,570) |  |
Release to income upon sale | (66,418) |  |  | (14,079) |  |
Release to income other than upon sale | (145,006) |  |  | (698,429) |  | (a)
Lessor contribution, top-ups and other | 6,559 |  |  | (53,627) |  | (a)
Accrued maintenance liability at end of period | $ | 2,567,107 |  |  | $ | 2,315,468 |  |
(a)Accrued maintenance liability released to income other than upon sale and lessor contribution, top-ups and other for the six months ended June 30, 2022 included amounts related to the Ukraine Conflict. Refer to Note 18—Net charges related to Ukraine Conflict for further details.

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