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EMPLOYEE BENEFIT PLANS EMPLOYEE BENEFIT PLANS - ADDITIONAL INFORMATION (Details) - plan
 1 Months Ended 12 Months Ended
Dec. 31, 2016
Dec. 31, 2016
Business Acquisition [Line Items]    
Number of defined benefit plans   4
Number of defined contribution plans   5
Virgin America Inc. [Member]    
Business Acquisition [Line Items]    
Number of defined contribution plans 6