Flight equipment subject to operating lease - Schedule of Flight Equipment Subject to Operating Lease (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Movement in Property, Plant and Equipment [Roll Forward]
Depreciation of flight equipment	$ (1,223,532)	$ (1,143,761)	$ (1,068,772)
Flight equipment subject to operating leases reclassified to flight equipment held for sale	(1,230,864)	(1,821,084)	(1,730,212)
Transfer of flight equipment to investment in sales-type lease	(33,778)	(106,043)	$ (66,907)
Flight Equipment
Movement in Property, Plant and Equipment [Roll Forward]
Net book value, beginning balance	28,170,466
Purchase of flight equipment	3,371,338
Depreciation of flight equipment	(1,223,532)
Flight equipment subject to operating leases reclassified to flight equipment held for sale	(1,230,864)
Transfer of flight equipment to investment in sales-type lease	(33,778)
Net book value, ending balance	29,053,630	$ 28,170,466
Accumulated depreciation at the end	$ (6,826,828)