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Flight equipment subject to operating lease - Schedule of Flight Equipment Subject to Operating Lease (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Movement in Property, Plant and Equipment [Roll Forward]        
Depreciation of flight equipment $ (311,126) $ (290,132) $ (914,433) $ (849,374)
Flight equipment subject to operating leases reclassified to flight equipment held for sale     (140,253) (1,143,096)
Transfer of flight equipment to investment in sales-type lease     (33,778) $ (74,017)
Flight Equipment        
Movement in Property, Plant and Equipment [Roll Forward]        
Net book value, beginning balance     28,170,466  
Purchase of flight equipment     2,445,407  
Depreciation of flight equipment     (914,433)  
Flight equipment subject to operating leases reclassified to flight equipment held for sale     (140,253)  
Transfer of flight equipment to investment in sales-type lease     (33,778)  
Net book value, ending balance 29,527,409   29,527,409  
Accumulated depreciation $ (6,846,920)   $ (6,846,920)