Commitments, Contingencies And Guarantees (Aircraft Acquisition Commitments) (Details)	3 Months Ended
	Jun. 30, 2013
Property Subject to or Available for Operating Lease [Line Items]
Aircraft purchase committment, future minimum quantity required, current (commitment)	15
Aircraft lease commitment, future minimum quantity required, current (commitment)	20
Aircraft purchase committment, future minimum quantity required, year two (commitment)	28
Aircraft lease commitment, future minimum quantity required, year two (commitment)	35
Aircraft purchase committment, future minimum quantity required, year three (commitment)	13
Aircraft lease commitment, future minimum quantity required, year three (commitment)	50
Aircraft purchase committment, future minimum quantity required, year four (commitment)	15
Aircraft lease commitment, future minimum quantity required, year four (commitment)	45
Aircraft purchase committment, future minimum quantity required, year five (commitment)	22
Aircraft lease commitment, future minimum quantity required, year five (commitment)	40
Aircraft purchase committment, future minimum quantity required, after year five (commitment)	224
Aircraft lease commitment, future minimum quantity required, after year five (commitment)	0
Total, Purchase	317
Total, Lease	190
Boeing 737 Family [Member]
Property Subject to or Available for Operating Lease [Line Items]
Aircraft purchase committment, future minimum quantity required, current (commitment)	13
Aircraft lease commitment, future minimum quantity required, current (commitment)	0
Aircraft purchase committment, future minimum quantity required, year two (commitment)	20
Aircraft lease commitment, future minimum quantity required, year two (commitment)	0
Aircraft purchase committment, future minimum quantity required, year three (commitment)	0
Aircraft lease commitment, future minimum quantity required, year three (commitment)	20
Aircraft purchase committment, future minimum quantity required, year four (commitment)	0
Aircraft lease commitment, future minimum quantity required, year four (commitment)	20
Aircraft purchase committment, future minimum quantity required, year five (commitment)	0
Aircraft lease commitment, future minimum quantity required, year five (commitment)	20
Aircraft purchase committment, future minimum quantity required, after year five (commitment)	0
Aircraft lease commitment, future minimum quantity required, after year five (commitment)	0
Total, Purchase	33
Total, Lease	60
Boeing 737 Max Aircraft [Member]
Property Subject to or Available for Operating Lease [Line Items]
Aircraft purchase committment, future minimum quantity required, current (commitment)	0
Aircraft lease commitment, future minimum quantity required, current (commitment)	0
Aircraft purchase committment, future minimum quantity required, year two (commitment)	0
Aircraft lease commitment, future minimum quantity required, year two (commitment)	0
Aircraft purchase committment, future minimum quantity required, year three (commitment)	0
Aircraft lease commitment, future minimum quantity required, year three (commitment)	0
Aircraft purchase committment, future minimum quantity required, year four (commitment)	0
Aircraft lease commitment, future minimum quantity required, year four (commitment)	0
Aircraft purchase committment, future minimum quantity required, year five (commitment)	3
Aircraft lease commitment, future minimum quantity required, year five (commitment)	0
Aircraft purchase committment, future minimum quantity required, after year five (commitment)	97
Aircraft lease commitment, future minimum quantity required, after year five (commitment)	0
Total, Purchase	100
Total, Lease	0
Boeing 777-300ER Aircraft [Member]
Property Subject to or Available for Operating Lease [Line Items]
Aircraft purchase committment, future minimum quantity required, current (commitment)	2
Aircraft lease commitment, future minimum quantity required, current (commitment)	0
Aircraft purchase committment, future minimum quantity required, year two (commitment)	6
Aircraft lease commitment, future minimum quantity required, year two (commitment)	0
Aircraft purchase committment, future minimum quantity required, year three (commitment)	2
Aircraft lease commitment, future minimum quantity required, year three (commitment)	0
Aircraft purchase committment, future minimum quantity required, year four (commitment)	2
Aircraft lease commitment, future minimum quantity required, year four (commitment)	0
Aircraft purchase committment, future minimum quantity required, year five (commitment)	0
Aircraft lease commitment, future minimum quantity required, year five (commitment)	0
Aircraft purchase committment, future minimum quantity required, after year five (commitment)	0
Aircraft lease commitment, future minimum quantity required, after year five (commitment)	0
Total, Purchase	12
Total, Lease	0
Boeing 787 Family [Member]
Property Subject to or Available for Operating Lease [Line Items]
Aircraft purchase committment, future minimum quantity required, current (commitment)	0
Aircraft lease commitment, future minimum quantity required, current (commitment)	0
Aircraft purchase committment, future minimum quantity required, year two (commitment)	2
Aircraft lease commitment, future minimum quantity required, year two (commitment)	0
Aircraft purchase committment, future minimum quantity required, year three (commitment)	11
Aircraft lease commitment, future minimum quantity required, year three (commitment)	0
Aircraft purchase committment, future minimum quantity required, year four (commitment)	13
Aircraft lease commitment, future minimum quantity required, year four (commitment)	0
Aircraft purchase committment, future minimum quantity required, year five (commitment)	9
Aircraft lease commitment, future minimum quantity required, year five (commitment)	0
Aircraft purchase committment, future minimum quantity required, after year five (commitment)	7
Aircraft lease commitment, future minimum quantity required, after year five (commitment)	0
Total, Purchase	42
Total, Lease	0
Airbus A320 Family [Member]
Property Subject to or Available for Operating Lease [Line Items]
Aircraft purchase committment, future minimum quantity required, current (commitment)	0
Aircraft lease commitment, future minimum quantity required, current (commitment)	20
Aircraft purchase committment, future minimum quantity required, year two (commitment)	0
Aircraft lease commitment, future minimum quantity required, year two (commitment)	35
Aircraft purchase committment, future minimum quantity required, year three (commitment)	0
Aircraft lease commitment, future minimum quantity required, year three (commitment)	30
Aircraft purchase committment, future minimum quantity required, year four (commitment)	0
Aircraft lease commitment, future minimum quantity required, year four (commitment)	25
Aircraft purchase committment, future minimum quantity required, year five (commitment)	0
Aircraft lease commitment, future minimum quantity required, year five (commitment)	20
Aircraft purchase committment, future minimum quantity required, after year five (commitment)	0
Aircraft lease commitment, future minimum quantity required, after year five (commitment)	0
Total, Purchase	0
Total, Lease	130
A320 Neo Airbus Aircraft [Member]
Property Subject to or Available for Operating Lease [Line Items]
Aircraft purchase committment, future minimum quantity required, current (commitment)	0
Aircraft lease commitment, future minimum quantity required, current (commitment)	0
Aircraft purchase committment, future minimum quantity required, year two (commitment)	0
Aircraft lease commitment, future minimum quantity required, year two (commitment)	0
Aircraft purchase committment, future minimum quantity required, year three (commitment)	0
Aircraft lease commitment, future minimum quantity required, year three (commitment)	0
Aircraft purchase committment, future minimum quantity required, year four (commitment)	0
Aircraft lease commitment, future minimum quantity required, year four (commitment)	0
Aircraft purchase committment, future minimum quantity required, year five (commitment)	10
Aircraft lease commitment, future minimum quantity required, year five (commitment)	0
Aircraft purchase committment, future minimum quantity required, after year five (commitment)	120
Aircraft lease commitment, future minimum quantity required, after year five (commitment)	0
Total, Purchase	130
Total, Lease	0
Capacity Purchase Arrangements [Member]
Property Subject to or Available for Operating Lease [Line Items]
Term of unrecorded unconditional purchase obligation	12 years
Capacity Purchase Arrangements [Member] | Embraer E-175 [Member]
Property Subject to or Available for Operating Lease [Line Items]
Aircraft to be acquired by Republic Airlines (aircraft)	47
First Class Seats (seats)	12
Main Cabin Seats (seats)	64
Capacity Purchase Arrangements [Member] | Minimum [Member] | Embraer E-175 [Member]
Property Subject to or Available for Operating Lease [Line Items]
Aircraft phased into operation each month (aircraft)	2
Capacity Purchase Arrangements [Member] | Maximum [Member] | Embraer E-175 [Member]
Property Subject to or Available for Operating Lease [Line Items]
Aircraft phased into operation each month (aircraft)	3