OPERATING SEGMENT INFORMATION (Tables) - USD ($)
$ in Millions

3 Months Ended

9 Months Ended

Sep. 30, 2024

Sep. 30, 2023

Sep. 30, 2024

Sep. 30, 2023

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, by Segment

Operating segment information is as follows:

	Three Months Ended September 30, 2024
(in millions)	Alaska Airlines		Hawaiian Airlines		Regional		Consolidating & Other		Air Group Adjusted			Special Items		Consolidated
Operating Revenue
Passenger revenue	$	2,261	$	84	$	476	$	—	$	2,821		$	—	$	2,821
Loyalty program other revenue	151		5		15		—		171			—		171
Cargo and other revenue	71		6		—		3		80			—		80
Total Operating Revenue	2,483		95		491		3		3,072			—		3,072
Operating Expenses
Operating expenses, excluding fuel	1,640		82		325		(14)		2,033			74		2,107
Fuel expense	510		23		95		—		628			(4)		624
Total Operating Expenses	2,150		105		420		(14)		2,661			70		2,731
Non-operating Income (Expense)	3		(4)		—		(11)		(12)			(1)		(13)
Income (Loss) Before Income Tax	$	336	$	(14)	$	71	$	6	$	399		$	(71)	$	328
Pretax Margin									13.0		%			10.7		%
	Three Months Ended September 30, 2023
(in millions)	Alaska Airlines		Hawaiian Airlines		Regional		Consolidating & Other		Air Group Adjusted			Special Items		Consolidated
Operating Revenue
Passenger revenue	$	2,201	$	—	$	417	$	—	$	2,618		$	—	$	2,618
Loyalty program other revenue	146		—		13		—		159			—		159
Cargo and other revenue	60		—		—		2		62			—		62
Total Operating Revenue	2,407		—		430		2		2,839			—		2,839
Operating Expenses
Operating expenses, excluding fuel	1,484		—		297		(3)		1,778			156		1,934
Fuel expense	621		—		108		—		729			(35)		694
Total Operating Expenses	2,105		—		405		(3)		2,507			121		2,628
Non-operating Income (Expense)	—		—		—		(10)		(10)			(8)		(18)
Income (Loss) Before Income Tax	$	302	$	—	$	25	$	(5)	$	322		$	(129)	$	193
Pretax Margin									11.4		%			6.8		%

	Nine Months Ended September 30, 2024
(in millions)	Alaska Airlines		Hawaiian Airlines		Regional		Consolidating & Other		Air Group Adjusted			Special Items		Consolidated
Operating Revenue
Passenger revenue	$	6,078	$	84	$	1,314	$	—	$	7,476		$	—	$	7,476
Loyalty program other revenue	460		5		44		—		509			—		509
Cargo and other revenue	202		6		—		8		216			—		216
Total Operating Revenue	6,740		95		1,358		8		8,201			—		8,201
Operating Expenses
Operating expenses, excluding fuel	4,670		82		946		(52)		5,646			254		5,900
Fuel expense	1,515		23		288		—		1,826			(22)		1,804
Total Operating Expenses	6,185		105		1,234		(52)		7,472			232		7,704
Non-operating Income (Expense)	6		(4)		—		(32)		(30)			(1)		(31)
Income (Loss) Before Income Tax	$	561	$	(14)	$	124	$	28	$	699		$	(233)	$	466
Pretax Margin									8.5		%			5.7		%

	Nine Months Ended September 30, 2023
(in millions)	Alaska Airlines		Hawaiian Airlines		Regional		Consolidating & Other		Air Group Adjusted			Special Items		Consolidated
Operating Revenue
Passenger revenue	$	6,082	$	—	$	1,118	$	—	$	7,200		$	—	$	7,200
Loyalty program other revenue	447		—		36		—		483			—		483
Cargo and other revenue	184		—		—		6		190			—		190
Total Operating Revenue	6,713		—		1,154		6		7,873			—		7,873
Operating Expenses
Operating expenses, excluding fuel	4,342		—		832		(1)		5,173			406		5,579
Fuel expense	1,672		—		274		—		1,946			(14)		1,932
Total Operating Expenses	6,014		—		1,106		(1)		7,119			392		7,511
Non-operating Income (Expense)	(3)		—		—		(26)		(29)			(14)		(43)
Income (Loss) Before Income Tax	$	696	$	—	$	48	$	(19)	$	725		$	(406)	$	319
Pretax Margin									9.2		%			4.1		%

Nonoperating Income (Expense)

$ (13)

$ (18)

$ (31)

$ (43)

Interest income

28

23

69

62

Operating Expenses, Excluding Fuel

2,107

1,934

5,900

5,579

Economic fuel

624

694

1,804

1,932

Operating Expenses

2,731

2,628

7,704

7,511

Income (Loss) Before Income Tax

$ 328

$ 193

$ 466

$ 319

Pretax Margin, GAAP

10.70%

6.80%

5.70%

4.10%

Pretax Margin, Adjusted

13.00%

11.40%

8.50%

9.20%