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COSTS AND EXPENSES BY NATURE (Details 1) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Material income and expense [abstract] |  |  |  |
Depreciation | [1] | $ 916,050 | $ 943,215 | $ 910,071
Amortization |  | 65,596 | 58,410 | 50,257
Total |  | $ 981,646 | $ 1,001,625 | $ 960,328
[1] | Include the depreciation of Property, plant and equipment and the maintenance cost of aircraft held under operating leases. The amount of maintenance cost included within the depreciation line item at December 31, 2018 is ThUS$ 366,393, ThUS$ 359,940 and ThUS$ 345,651 for the same period of 2017 and 2016 respectavely.

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