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CURRENT AND DEFERRED TAXES (Details) - Schedule of income before tax from the Chilean legal tax rate - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Schedule of income before tax from the Chilean legal tax rate [Abstract]      
Tax expense using the legal rate $ (1,378,547) $ 38,318 $ 11,230
Tax expense using the legal rate, percentage 27.00% 27.00% 27.00%
Tax effect by change in tax rate $ 5,587
Tax effect by change in tax rate, percentage 1.34%
Tax effect of rates in other jurisdictions $ (58,268) $ 20,082 $ 15,905
Tax effect of rates in other jurisdictions, percentage 1.14% 14.15% 3.83%
Tax effect of non-taxable operating revenues $ (19,529) $ (13,125) $ (3,076)
Tax effect of non-taxable operating revenues, percentage 0.38% (9.25%) (0.74%)
Tax effect of disallowable expenses $ 40,528 $ 66,257 $ 61,295
Tax effect of disallowable expenses, percentage (0.79%) 46.69% 14.75%
Derecognition of deferred tax liabilities for early termination of aircraft financing $ (294,969) $ (145,930)
Derecognition of deferred tax liabilities for early termination of aircraft financing, percentage 5.78% (102.83%)
Tax effect of due to the non-use of tax losses $ 453,681
Tax effect of due to the non-use of tax losses, percentage (8.89%)
Derecognition of deferred tax assets not recoverable $ 237,637
Derecognition of deferred tax assets not recoverable, percentage (4.65%)
Deferred tax asset not recognized $ 414,741
Deferred tax asset not recognized, percentage (8.12%)
Other increases (decreases) $ 54,538 $ (19,299)
Other increases (decreases), percentage (1.07%) (13.60%)
Total adjustments to tax expense using the legal rate $ 828,359 $ (92,015) $ 79,711
Total adjustments to tax expense using the legal rate, percentage (16.22%) (64.84%) 19.18%
Tax expense using the effective rate $ (550,188) $ (53,697) $ 90,941
Tax expense using the effective rate, percentage 10.78% (37.84%) 46.18%