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PROPERTY, PLANT AND EQUIPMENT - Schedule of fully depreciated assets and commitments for future purchases (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Disclosure of detailed information about property, plant and equipment [abstract]    
Gross book value of fully depreciated property, plant and equipment still in use $ 288,454 $ 266,896
Commitments for the acquisition of aircraft $ 15,700,000 $ 13,100,000