| Accrued maintenance liability Movements in accrued maintenance liability during the years ended December 31, 2025 and 2024 were as follows: | | | | | | | | | | | | | Year Ended December 31, | | 2025 | | 2024 | | Accrued maintenance liability at beginning of period | $ | 3,327,347 | | | $ | 2,863,730 | | | Maintenance payments received | 969,885 | | | 920,932 | | | Maintenance payments returned | (248,634) | | | (248,017) | | | Release to income upon sale | (142,276) | | | (31,758) | | | Release to income other than upon sale | (227,385) | | | (163,405) | | | Lessor contribution, top ups and other | (144,549) | | | (14,135) | | | Accrued maintenance liability at end of period | $ | 3,534,388 | | | $ | 3,327,347 | |
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