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OTHER NON-FINANCIAL ASSETS (Details)
$ in Thousands
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
OTHER NON-FINANCIAL ASSETS (Details) [Line Items]    
Reserve maintainance $ (1,388,185) $ (367,577)
Number of aircraft under operating leases 2  
Aircraft [member]    
OTHER NON-FINANCIAL ASSETS (Details) [Line Items]    
Reserve maintainance $ 8,613 $ 45,831