LEASES - Narrative (Details)	Dec. 31, 2024 aircraft
Lessee, Lease, Description [Line Items]
Number of leased aircraft, finance lease	2
Number of leased aircraft, operating lease	4
Minimum
Lessee, Lease, Description [Line Items]
Remaining lease term (in years)	1 year
Maximum
Lessee, Lease, Description [Line Items]
Remaining lease term (in years)	11 years
B737-800F | Alaska Air Group
Lessee, Lease, Description [Line Items]
Number of leased aircraft	10
B-737-800 Freighter | Alaska Air Group
Lessee, Lease, Description [Line Items]
Number of leased aircraft	2
B-737-900 | Alaska Air Group
Lessee, Lease, Description [Line Items]
Number of leased aircraft	14
A-330-200 | Hawaiian Holdings, Inc.
Lessee, Lease, Description [Line Items]
Number of leased aircraft	12
A321-200neo | Hawaiian Holdings, Inc.
Lessee, Lease, Description [Line Items]
Number of leased aircraft	4
A-330-300 | Hawaiian Holdings, Inc.
Lessee, Lease, Description [Line Items]
Number of leased aircraft not accounted as leases	6
Embraer E175 aircraft | Minimum
Lessee, Lease, Description [Line Items]
Operating lease remaining lease term (in years)	5 years
Embraer E175 aircraft | Maximum
Lessee, Lease, Description [Line Items]
Operating lease remaining lease term (in years)	10 years
Embraer E175 aircraft | Alaska Air Group | SkyWest
Lessee, Lease, Description [Line Items]
Number of leased aircraft	42