Pension and Other Post-Retirement Benefit Plans (Schedule of Assumptions) (Details)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Pension Plans [Member]
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Expected return on plan assets	6.25%	6.75%	6.75%
Crewmembers [Member] | Pension Plans [Member]
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount rate	5.25%	4.25%	5.10%
Non-crewmembers [Member] | Pension Plans [Member]
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount rate	5.35%	4.25%	4.65%
Pilots [Member] | Post-Retirement Healthcare Plans [Member]
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount rate	4.15%	3.35%	4.60%
Non-pilots [Member] | Post-Retirement Healthcare Plans [Member]
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount rate	3.85%	2.95%	4.05%