Nature of Operations and Summary of Significant Accounting Policies - Aircraft Fleet (Details)	12 Months Ended
	Dec. 31, 2025 aircraft item
Nature of Operations and Summary of Significant Accounting Policies [Line Items]
Number of daily departures	2,260
Number of aircraft held by entity	637
E175
Nature of Operations and Summary of Significant Accounting Policies [Line Items]
Number of aircraft held by entity	270
E175 | Maximum
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	51
Number of seats on aircraft | item	50
CRJ 900 | Minimum
Nature of Operations and Summary of Significant Accounting Policies [Line Items]
Number of seats on aircraft	50
CRJ 900 | Maximum
Nature of Operations and Summary of Significant Accounting Policies [Line Items]
Number of seats on aircraft	76
CRJ 700
Nature of Operations and Summary of Significant Accounting Policies [Line Items]
Number of seats on aircraft	50
CRJ 700 | Minimum
Nature of Operations and Summary of Significant Accounting Policies [Line Items]
Number of seats on aircraft	50
CRJ 700 | Maximum
Nature of Operations and Summary of Significant Accounting Policies [Line Items]
Number of seats on aircraft	76
CRJ700/CRJ550
Nature of Operations and Summary of Significant Accounting Policies [Line Items]
Number of aircraft held by entity	178
CRJ 550 | Minimum
Nature of Operations and Summary of Significant Accounting Policies [Line Items]
Number of seats on aircraft	50
CRJ 550 | Maximum
Nature of Operations and Summary of Significant Accounting Policies [Line Items]
Number of seats on aircraft	76
CRJ 200
Nature of Operations and Summary of Significant Accounting Policies [Line Items]
Number of aircraft held by entity	138
Number of seats on aircraft	50
United
Nature of Operations and Summary of Significant Accounting Policies [Line Items]
Number of aircraft held by entity	216
Percentage of aggregate capacity operated	44.40%
United | E175
Nature of Operations and Summary of Significant Accounting Policies [Line Items]
Number of aircraft held by entity	121
United | CRJ700/CRJ550
Nature of Operations and Summary of Significant Accounting Policies [Line Items]
Number of aircraft held by entity	37
United | CRJ 200
Nature of Operations and Summary of Significant Accounting Policies [Line Items]
Number of aircraft held by entity	58
Delta
Nature of Operations and Summary of Significant Accounting Policies [Line Items]
Number of aircraft held by entity	137
Percentage of aggregate capacity operated	28.10%
Delta | E175
Nature of Operations and Summary of Significant Accounting Policies [Line Items]
Number of aircraft held by entity	87
Delta | CRJ 900
Nature of Operations and Summary of Significant Accounting Policies [Line Items]
Number of aircraft held by entity	32
Delta | CRJ700/CRJ550
Nature of Operations and Summary of Significant Accounting Policies [Line Items]
Number of aircraft held by entity	18
American
Nature of Operations and Summary of Significant Accounting Policies [Line Items]
Number of aircraft held by entity	92
Percentage of aggregate capacity operated	18.90%
American | E175
Nature of Operations and Summary of Significant Accounting Policies [Line Items]
Number of aircraft held by entity	20
American | CRJ 900
Nature of Operations and Summary of Significant Accounting Policies [Line Items]
Number of aircraft held by entity	4
American | CRJ700/CRJ550
Nature of Operations and Summary of Significant Accounting Policies [Line Items]
Number of aircraft held by entity	68
Alaska
Nature of Operations and Summary of Significant Accounting Policies [Line Items]
Number of aircraft held by entity	42
Percentage of aggregate capacity operated	8.60%
Alaska | E175
Nature of Operations and Summary of Significant Accounting Policies [Line Items]
Number of aircraft held by entity	42
Aircraft in schedule service or under contract
Nature of Operations and Summary of Significant Accounting Policies [Line Items]
Number of aircraft held by entity	487
Aircraft in schedule service or under contract | E175
Nature of Operations and Summary of Significant Accounting Policies [Line Items]
Number of aircraft held by entity	270
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	36
Aircraft in schedule service or under contract | CRJ700/CRJ550
Nature of Operations and Summary of Significant Accounting Policies [Line Items]
Number of aircraft held by entity	123
Aircraft in schedule service or under contract | CRJ 200
Nature of Operations and Summary of Significant Accounting Policies [Line Items]
Number of aircraft held by entity	58
SWC
Nature of Operations and Summary of Significant Accounting Policies [Line Items]
Number of aircraft held by entity	11
SWC | CRJ 200
Nature of Operations and Summary of Significant Accounting Policies [Line Items]
Number of aircraft held by entity	11
Number of seats on aircraft	30
Leased to third parties
Nature of Operations and Summary of Significant Accounting Policies [Line Items]
Number of aircraft held by entity	45
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 | CRJ700/CRJ550
Nature of Operations and Summary of Significant Accounting Policies [Line Items]
Number of aircraft held by entity	40
Other
Nature of Operations and Summary of Significant Accounting Policies [Line Items]
Number of aircraft held by entity	94
Other | CRJ 900
Nature of Operations and Summary of Significant Accounting Policies [Line Items]
Number of aircraft held by entity	10
Other | CRJ700/CRJ550
Nature of Operations and Summary of Significant Accounting Policies [Line Items]
Number of aircraft held by entity	15
Other | CRJ 200
Nature of Operations and Summary of Significant Accounting Policies [Line Items]
Number of aircraft held by entity	69