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INTANGIBLE ASSETS OTHER THAN GOODWILL (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Disclosure of detailed information about intangible assets [line items]        
Intangible assets other than goodwill $ 1,617,247 $ 1,610,313 $ 1,321,425 $ 1,880,079
Gross Book Value [Member]        
Disclosure of detailed information about intangible assets [line items]        
Intangible assets other than goodwill 1,981,284 1,880,354    
Airport Slots [Member]        
Disclosure of detailed information about intangible assets [line items]        
Intangible assets other than goodwill [1] 964,513 978,849 816,987 1,201,028
Airport Slots [Member] | Gross Book Value [Member]        
Disclosure of detailed information about intangible assets [line items]        
Intangible assets other than goodwill 964,513 978,849    
Loyalty Program [Member]        
Disclosure of detailed information about intangible assets [line items]        
Intangible assets other than goodwill 321,440 326,262    
Loyalty Program [Member] | Gross Book Value [Member]        
Disclosure of detailed information about intangible assets [line items]        
Intangible assets other than goodwill 321,440 326,262    
Computer Software [Member]        
Disclosure of detailed information about intangible assets [line items]        
Intangible assets other than goodwill 160,970 157,016 104,258 126,797
Computer Software [Member] | Gross Book Value [Member]        
Disclosure of detailed information about intangible assets [line items]        
Intangible assets other than goodwill 509,377 419,652    
Developing Software [Member]        
Disclosure of detailed information about intangible assets [line items]        
Intangible assets other than goodwill 123,415 91,053 $ 74,887 $ 74,050
Developing Software [Member] | Gross Book Value [Member]        
Disclosure of detailed information about intangible assets [line items]        
Intangible assets other than goodwill 123,415 91,053    
Trade Marks [Member]        
Disclosure of detailed information about intangible assets [line items]        
Intangible assets other than goodwill 46,909 57,133    
Trade Marks [Member] | Gross Book Value [Member]        
Disclosure of detailed information about intangible assets [line items]        
Intangible assets other than goodwill 62,539 63,730    
Other Assets [Member]        
Disclosure of detailed information about intangible assets [line items]        
Intangible assets other than goodwill      
Other Assets [Member] | Gross Book Value [Member]        
Disclosure of detailed information about intangible assets [line items]        
Intangible assets other than goodwill $ 808    
[1] See Note 2.5