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OTHER FINANCIAL LIABILITIES (Details) - Schedule of hedging instruments - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Cross currency swaps (CCS) [Member]    
OTHER FINANCIAL LIABILITIES (Details) - Schedule of hedging instruments [Line Items]    
Fair values of net assets/ (liabilities) [1] $ (22,662)
Interest rate swaps [Member]    
OTHER FINANCIAL LIABILITIES (Details) - Schedule of hedging instruments [Line Items]    
Fair values of net assets/ (liabilities) [2] (2,734) 2,618
Fuel options [Member]    
OTHER FINANCIAL LIABILITIES (Details) - Schedule of hedging instruments [Line Items]    
Fair values of net assets/ (liabilities) [3] 1,296 48,542
Currency options CLP/US$    
OTHER FINANCIAL LIABILITIES (Details) - Schedule of hedging instruments [Line Items]    
Fair values of net assets/ (liabilities) [4] $ (41)
[1] Covers the significant variations in cash flows associated with market risk implicit in the changes in the 3-month LIBOR interest rate and the exchange rate US$/UF of bank loans. These contracts are recorded as cash flow hedges and fair value.
[2] Covers the significant variations in cash flows associated with market risk implicit in the increases in the 3 months LIBOR interest rates for long-term loans incurred in the acquisition of aircraft and bank loans. These contracts are recorded as cash flow hedges.
[3] Covers significant variations in cash flows associated with market risk implicit in the changes in the price of future fuel purchases. These contracts are recorded as cash flow hedges.
[4] They cover the exposure to foreign exchange risk of operating cash flows, mainly caused by the fluctuation of the CLP/US$, R$/US$, US$/EUR and US$/GBP exchange rate. These contracts are registered as cash flow hedge contracts.