Nature of Operations and Summary of Significant Accounting Policies (Details)	12 Months Ended
	Dec. 31, 2014 aircraft item
Condensed Consolidated Financial Statements
Number of daily departures to different destinations	3,600
Agreements with other airlines
Number of aircrafts held by entity	749
United
Agreements with other airlines
Number of aircrafts held by entity	425
Percentage of aggregate capacity operated	61.40%
Delta
Agreements with other airlines
Number of aircrafts held by entity	239
Percentage of aggregate capacity operated	31.60%
American
Agreements with other airlines
Number of aircrafts held by entity	29
Percentage of aggregate capacity operated	3.20%
US Airways
Agreements with other airlines
Number of aircrafts held by entity	15
Percentage of aggregate capacity operated	1.70%
Alaska
Agreements with other airlines
Number of aircrafts held by entity	9
Percentage of aggregate capacity operated	2.10%
Subleased to an un-affiliated entity
Agreements with other airlines
Number of aircrafts held by entity	2
Other
Agreements with other airlines
Number of aircrafts held by entity	30
CRJ 200
Agreements with other airlines
Number of aircrafts held by entity	248
CRJ 200 | United
Agreements with other airlines
Number of aircrafts held by entity	89
CRJ 200 | Delta
Agreements with other airlines
Number of aircrafts held by entity	113
CRJ 200 | American
Agreements with other airlines
Number of aircrafts held by entity	29
CRJ 200 | US Airways
Agreements with other airlines
Number of aircrafts held by entity	11
CRJ 200 | Subleased to an un-affiliated entity
Agreements with other airlines
Number of aircrafts held by entity	2
CRJ 200 | Other
Agreements with other airlines
Number of aircrafts held by entity	4
CRJ 700
Agreements with other airlines
Number of aircrafts held by entity	139
CRJ 700 | United
Agreements with other airlines
Number of aircrafts held by entity	70
CRJ 700 | Delta
Agreements with other airlines
Number of aircrafts held by entity	60
CRJ 700 | Alaska
Agreements with other airlines
Number of aircrafts held by entity	9
CRJ 900
Agreements with other airlines
Number of aircrafts held by entity	64
CRJ 900 | Delta
Agreements with other airlines
Number of aircrafts held by entity	60
CRJ 900 | US Airways
Agreements with other airlines
Number of aircrafts held by entity	4
ERJ135
Agreements with other airlines
Number of aircrafts held by entity	9
ERJ135 | United
Agreements with other airlines
Number of aircrafts held by entity	9
ERJ 145
Agreements with other airlines
Number of aircrafts held by entity	226
ERJ 145 | United
Agreements with other airlines
Number of aircrafts held by entity	216
ERJ 145 | Other
Agreements with other airlines
Number of aircrafts held by entity	10
E175
Agreements with other airlines
Number of aircrafts held by entity	20
E175 | United
Agreements with other airlines
Number of aircrafts held by entity	20
EMB 120
Agreements with other airlines
Number of aircrafts held by entity	43
EMB 120 | United
Agreements with other airlines
Number of aircrafts held by entity	21
EMB 120 | Delta
Agreements with other airlines
Number of aircrafts held by entity	6
EMB 120 | Other
Agreements with other airlines
Number of aircrafts held by entity	16