LONG-TERM DEBT - LINE OF CREDIT (Details)	9 Months Ended
	Sep. 30, 2016 USD ($) aircraft credit_facility
Line of Credit Facility [Line Items]
Line of Credit Facility, Number of Credit Facilities | credit_facility	3
Secured by aircraft [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Expiration Date	Sep. 30, 2017
Secured by other [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Expiration Date	Mar. 31, 2017
Credit Facilities 1 and 2 [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Number of Credit Facilities | credit_facility	2
Credit Facility 1 [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Asset Restrictions	$ 500,000,000
Credit Facility 1 [Member] | Secured by aircraft [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Number of Credit Facilities | credit_facility	1
Line of Credit Facility, Maximum Borrowing Capacity	$ 100,000,000
Credit Facility 2 [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Asset Restrictions	500,000,000
Credit Facility 2 [Member] | Secured by other [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	100,000,000
Credit Facility 3 [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Asset Restrictions	$ 500,000,000
Credit Facility 3 [Member] | Secured by aircraft [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Number of Credit Facilities | credit_facility	1
Line of Credit Facility, Maximum Borrowing Capacity	$ 52,000,000
B-737-800 [Member] | Credit Facility 3 [Member]
Line of Credit Facility [Line Items]
Number of Aircraft Securing Credit Facility | aircraft	2