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Accrued maintenance liability (Tables)
 6 Months Ended
Jun. 30, 2025
Accrued Maintenance Liability [Abstract]  
Schedule of movements in accrued maintenance liability
Movements in accrued maintenance liability during the six months ended June 30, 2025 and 2024 were as follows:
Six Months Ended June 30,
20252024
Accrued maintenance liability at beginning of period$3,327,347 $2,863,730 
Maintenance payments received462,937 442,130 
Maintenance payments returned(81,268)(178,364)
Release to income upon sale(90,637)(2,766)
Release to income other than upon sale(76,389)(112,413)
Lessor contribution, top-ups and other(73,104)(33,048)
Accrued maintenance liability at end of period$3,468,886 $2,979,269