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Fair value measurements - Fair Value Measurement Inputs and Valuation Techniques (Details) $ in Thousands	Dec. 31, 2022 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Flight equipment, fair value	$ 459,883,544
Discount rate \| Income approach
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Weighted average rate	0.07
Non-contractual cash flows as a % of total cash flows \| Income approach
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Weighted average rate	0.93