FLEET TRANSITION (DETAILS) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Restructuring Cost and Reserve [Line Items]
Fleet transition costs CRJ 700			$ 30.9
Fleet transition costs	26.8	3.4	36.9	3.4
Fleet Transition [Member] | Q200 [Member]
Restructuring Cost and Reserve [Line Items]
Number Of Aircraft Subleased To A Third Party Carrier			16
Fleet Transition [Member] | CRJ 700 [Member]
Restructuring Cost and Reserve [Line Items]
Number Of Aircraft Subleased To A Third Party Carrier	13
Q200 [Member]
Restructuring Cost and Reserve [Line Items]
Fleet transition costs Q200			$ 6.0