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PROPERTY, PLANT AND EQUIPMENT - Schedule of fully depreciated assets and commitments for future purchases (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Disclosure of detailed information about property, plant and equipment [abstract]    
Gross book value of fully depreciated property, plant and equipment still in use $ 326,642 $ 288,454
Commitments for the acquisition of aircraft $ 20,400,000 $ 15,700,000