EMPLOYEE BENEFIT PLANS  - Asset Allocation (Details)	Dec. 31, 2024	Dec. 31, 2023
Qualified Defined Benefit Plan - Salaried | Alaska Air Group
Defined Benefit Plan Disclosure [Line Items]
Actual Allocations	100.00%	100.00%
Qualified Defined Benefit Plan - Salaried | Hawaiian Holdings, Inc.
Defined Benefit Plan Disclosure [Line Items]
Target Allocations	100.00%
Actual Allocations	100.00%
Pension Plan | Alaska Air Group
Defined Benefit Plan Disclosure [Line Items]
Actual Allocations	100.00%	100.00%
Equity securities | Qualified Defined Benefit Plan - Salaried | Hawaiian Holdings, Inc.
Defined Benefit Plan Disclosure [Line Items]
Target Allocations	60.00%
Actual Allocations	52.00%
Domestic equity securities | Qualified Defined Benefit Plan - Salaried | Alaska Air Group
Defined Benefit Plan Disclosure [Line Items]
Actual Allocations	0.00%	7.00%
Domestic equity securities | Pension Plan | Alaska Air Group
Defined Benefit Plan Disclosure [Line Items]
Actual Allocations	34.00%	36.00%
Non-U.S. equity securities | Qualified Defined Benefit Plan - Salaried | Alaska Air Group
Defined Benefit Plan Disclosure [Line Items]
Actual Allocations	0.00%	3.00%
Non-U.S. equity securities | Pension Plan | Alaska Air Group
Defined Benefit Plan Disclosure [Line Items]
Actual Allocations	13.00%	15.00%
Fixed income securities | Qualified Defined Benefit Plan - Salaried | Alaska Air Group
Defined Benefit Plan Disclosure [Line Items]
Actual Allocations	100.00%	90.00%
Fixed income securities | Qualified Defined Benefit Plan - Salaried | Hawaiian Holdings, Inc.
Defined Benefit Plan Disclosure [Line Items]
Target Allocations	35.00%
Actual Allocations	44.00%
Fixed income securities | Pension Plan | Alaska Air Group
Defined Benefit Plan Disclosure [Line Items]
Actual Allocations	50.00%	45.00%
Real estate | Qualified Defined Benefit Plan - Salaried | Alaska Air Group
Defined Benefit Plan Disclosure [Line Items]
Actual Allocations	0.00%	0.00%
Real estate | Qualified Defined Benefit Plan - Salaried | Hawaiian Holdings, Inc.
Defined Benefit Plan Disclosure [Line Items]
Target Allocations	5.00%
Actual Allocations	4.00%
Real estate | Pension Plan | Alaska Air Group
Defined Benefit Plan Disclosure [Line Items]
Actual Allocations	3.00%	4.00%
Maximum | Domestic equity securities | Pension Plan | Alaska Air Group
Defined Benefit Plan Disclosure [Line Items]
Target Allocations	44.00%
Maximum | Non-U.S. equity securities | Pension Plan | Alaska Air Group
Defined Benefit Plan Disclosure [Line Items]
Target Allocations	22.00%
Maximum | Fixed income securities | Pension Plan | Alaska Air Group
Defined Benefit Plan Disclosure [Line Items]
Target Allocations	85.00%
Maximum | Real estate | Pension Plan | Alaska Air Group
Defined Benefit Plan Disclosure [Line Items]
Target Allocations	10.00%
Minimum | Domestic equity securities | Qualified Defined Benefit Plan - Salaried | Alaska Air Group
Defined Benefit Plan Disclosure [Line Items]
Target Allocations	0.00%
Minimum | Domestic equity securities | Pension Plan | Alaska Air Group
Defined Benefit Plan Disclosure [Line Items]
Target Allocations	6.00%
Minimum | Non-U.S. equity securities | Qualified Defined Benefit Plan - Salaried | Alaska Air Group
Defined Benefit Plan Disclosure [Line Items]
Target Allocations	0.00%
Minimum | Non-U.S. equity securities | Pension Plan | Alaska Air Group
Defined Benefit Plan Disclosure [Line Items]
Target Allocations	0.00%
Minimum | Fixed income securities | Qualified Defined Benefit Plan - Salaried | Alaska Air Group
Defined Benefit Plan Disclosure [Line Items]
Target Allocations	100.00%
Minimum | Fixed income securities | Pension Plan | Alaska Air Group
Defined Benefit Plan Disclosure [Line Items]
Target Allocations	35.00%
Minimum | Real estate | Qualified Defined Benefit Plan - Salaried | Alaska Air Group
Defined Benefit Plan Disclosure [Line Items]
Target Allocations	0.00%
Minimum | Real estate | Pension Plan | Alaska Air Group
Defined Benefit Plan Disclosure [Line Items]
Target Allocations	0.00%