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SEGMENTAL INFORMATION (Details 1) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Net cash flows from      
Purchases of property, plant and equipment $ (403,666) $ (694,370) $ (1,569,749)
Purchases of intangible assets (87,318) (88,587) (52,449)
Net cash flows from (used in) operating activities 1,666,740 980,884 1,672,101
Net cash flow from (used in) investing activities (287,422) (431,789) (1,695,695)
Net cash flows from (used in) financing activities (1,179,088) (396,279) (128,360)
Air Transportation [Member]      
Net cash flows from      
Purchases of property, plant and equipment 403,282 693,581 691,930
Additions associated with maintenance 218,537 197,866 230,526
Other additions 184,745 495,715 461,404
Purchases of intangible assets 79,102 84,377 41,399
Net cash flows from (used in) operating activities 1,489,797 827,108 1,531,395
Net cash flow from (used in) investing activities (278,790) (426,989) (1,679,272)
Net cash flows from (used in) financing activities (1,010,705) (246,907) (4,708)
Coalition And Loyalty Program Multiplus [Member]      
Net cash flows from      
Purchases of property, plant and equipment 384 789 2,440
Additions associated with maintenance
Other additions 384 789 2,440
Purchases of intangible assets 8,216 4,210 11,050
Net cash flows from (used in) operating activities 186,367 154,411 147,348
Net cash flow from (used in) investing activities (8,632) (4,800) (16,423)
Net cash flows from (used in) financing activities (168,383) (149,372) (123,652)
Eliminations [Member]      
Net cash flows from      
Purchases of property, plant and equipment
Additions associated with maintenance
Other additions
Purchases of intangible assets
Net cash flows from (used in) operating activities (9,424) (635) (6,642)
Net cash flow from (used in) investing activities
Net cash flows from (used in) financing activities
Operating Segments [Member]      
Net cash flows from      
Purchases of property, plant and equipment 403,666 694,370 694,370
Additions associated with maintenance 218,537 197,866 230,526
Other additions 185,129 496,504 463,844
Purchases of intangible assets 87,318 88,587 52,449
Net cash flows from (used in) operating activities 1,666,740 980,884 1,672,101
Net cash flow from (used in) investing activities (287,422) (431,789) (1,695,695)
Net cash flows from (used in) financing activities $ (1,179,088) $ (396,279) $ (128,360)