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Financial instruments and risk management - Jet fuel price risk (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Financial instruments and risk management      
Intrinsic value recycled to the fuel cost     $ 619
Jet fuel      
Financial instruments and risk management      
Percentage of operating expenses 38.00% 46.00% 34.00%