Nature of Operations and Summary of Significant Accounting Policies - Aircraft Fleet (Details)	12 Months Ended
	Dec. 31, 2021 aircraft
Nature of Operations and Summary of Significant Accounting Policies [Line Items]
Number of daily departures	2,080
Number of aircraft held by entity	629
E175 [Member]
Nature of Operations and Summary of Significant Accounting Policies [Line Items]
Number of aircraft held by entity	211
E175 [Member] | Minimum [Member]
Nature of Operations and Summary of Significant Accounting Policies [Line Items]
Number of seats on aircraft	65
E175 [Member] | Maximum [Member]
Nature of Operations and Summary of Significant Accounting Policies [Line Items]
Number of seats on aircraft	76
CRJ 900
Nature of Operations and Summary of Significant Accounting Policies [Line Items]
Number of aircraft held by entity	49
CRJ 900 | Minimum [Member]
Nature of Operations and Summary of Significant Accounting Policies [Line Items]
Number of seats on aircraft	65
CRJ 900 | Maximum [Member]
Nature of Operations and Summary of Significant Accounting Policies [Line Items]
Number of seats on aircraft	76
CRJ 700 [Member]
Nature of Operations and Summary of Significant Accounting Policies [Line Items]
Number of aircraft held by entity	166
CRJ 700 [Member] | Minimum [Member]
Nature of Operations and Summary of Significant Accounting Policies [Line Items]
Number of seats on aircraft	65
CRJ 700 [Member] | Maximum [Member]
Nature of Operations and Summary of Significant Accounting Policies [Line Items]
Number of seats on aircraft	76
CRJ 200 [Member]
Nature of Operations and Summary of Significant Accounting Policies [Line Items]
Number of aircraft held by entity	203
Number of seats on aircraft	50
United
Nature of Operations and Summary of Significant Accounting Policies [Line Items]
Number of aircraft held by entity	220
Percentage of aggregate capacity operated	43.20%
United | E175 [Member]
Nature of Operations and Summary of Significant Accounting Policies [Line Items]
Number of aircraft held by entity	90
United | CRJ 700 [Member]
Nature of Operations and Summary of Significant Accounting Policies [Line Items]
Number of aircraft held by entity	19
United | CRJ 200 [Member]
Nature of Operations and Summary of Significant Accounting Policies [Line Items]
Number of aircraft held by entity	111
Delta
Nature of Operations and Summary of Significant Accounting Policies [Line Items]
Number of aircraft held by entity	149
Percentage of aggregate capacity operated	29.30%
Delta | E175 [Member]
Nature of Operations and Summary of Significant Accounting Policies [Line Items]
Number of aircraft held by entity	71
Delta | CRJ 900
Nature of Operations and Summary of Significant Accounting Policies [Line Items]
Number of aircraft held by entity	44
Delta | CRJ 700 [Member]
Nature of Operations and Summary of Significant Accounting Policies [Line Items]
Number of aircraft held by entity	5
Delta | CRJ 200 [Member]
Nature of Operations and Summary of Significant Accounting Policies [Line Items]
Number of aircraft held by entity	29
American
Nature of Operations and Summary of Significant Accounting Policies [Line Items]
Number of aircraft held by entity	108
Percentage of aggregate capacity operated	21.20%
American | E175 [Member]
Nature of Operations and Summary of Significant Accounting Policies [Line Items]
Number of aircraft held by entity	18
American | CRJ 700 [Member]
Nature of Operations and Summary of Significant Accounting Policies [Line Items]
Number of aircraft held by entity	90
Alaska
Nature of Operations and Summary of Significant Accounting Policies [Line Items]
Number of aircraft held by entity	32
Percentage of aggregate capacity operated	6.30%
Alaska | E175 [Member]
Nature of Operations and Summary of Significant Accounting Policies [Line Items]
Number of aircraft held by entity	32
Aircraft in schedule service or under contract
Nature of Operations and Summary of Significant Accounting Policies [Line Items]
Number of aircraft held by entity	509
Aircraft in schedule service or under contract | E175 [Member]
Nature of Operations and Summary of Significant Accounting Policies [Line Items]
Number of aircraft held by entity	211
Aircraft in schedule service or under contract | CRJ 900
Nature of Operations and Summary of Significant Accounting Policies [Line Items]
Number of aircraft held by entity	44
Aircraft in schedule service or under contract | CRJ 700 [Member]
Nature of Operations and Summary of Significant Accounting Policies [Line Items]
Number of aircraft held by entity	114
Aircraft in schedule service or under contract | CRJ 200 [Member]
Nature of Operations and Summary of Significant Accounting Policies [Line Items]
Number of aircraft held by entity	140
Leased to third parties
Nature of Operations and Summary of Significant Accounting Policies [Line Items]
Number of aircraft held by entity	39
Leased to third parties | CRJ 900
Nature of Operations and Summary of Significant Accounting Policies [Line Items]
Number of aircraft held by entity	5
Leased to third parties | CRJ 700 [Member]
Nature of Operations and Summary of Significant Accounting Policies [Line Items]
Number of aircraft held by entity	34
Other
Nature of Operations and Summary of Significant Accounting Policies [Line Items]
Number of aircraft held by entity	81
Other | CRJ 700 [Member]
Nature of Operations and Summary of Significant Accounting Policies [Line Items]
Number of aircraft held by entity	18
Other | CRJ 200 [Member]
Nature of Operations and Summary of Significant Accounting Policies [Line Items]
Number of aircraft held by entity	63