Commitments and contingencies - Schedule of Prepayments of Flight Equipment (Details) - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
|
| Prepayments on Flight Equipment [Roll Forward] | ||
| Prepayments on flight equipment at beginning of period | $ 3,460,296 | $ 3,576,187 |
| Prepayments and additions during the period, net | 2,251,405 | 1,418,813 |
| Interest paid and capitalized during the period, net | 145,970 | 122,467 |
| Prepayments and capitalized interest applied to the purchase of flight equipment | (1,584,905) | (1,657,171) |
| Prepayments on flight equipment at end of period | $ 4,272,766 | $ 3,460,296 |