Operating segment information is as follows (in millions):



	Three Months Ended September 30, 2015
	Alaska
	Mainline			Regional		Horizon			Consolidating			Air Group Adjusted^(a)			Special Items^(b)			Consolidated
Operating revenues
Passenger
Mainline	$	1,057		$	—	$	—		$	—		$	1,057		$	—		$	1,057
Regional	—			240		—			—			240			—			240
Total passenger revenues	1,057			240		—			—			1,297			—			1,297
CPA revenues	—			—		105			(105		)	—			—			—
Freight and mail	29			1		—			—			30			—			30
Other - net	167			20		1			—			188						188
Total operating revenues	1,253			261		106			(105		)	1,515			—			1,515

Operating expenses
Operating expenses, excluding fuel	667			181		93			(104		)	837			—			837
Economic fuel	205			35		—			—			240			5			245
Total operating expenses	872			216		93			(104		)	1,077			5			1,082

Nonoperating income (expense)
Interest income	5			—		—			—			5			—			5
Interest expense	(7		)	—		(3		)	—			(10		)	—			(10		)
Other	7			—		—			2			9			—			9
	5			—		(3		)	2			4			—			4
Income before income tax	$	386		$	45	$	10		$	1		$	442		$	(5	)	$	437



	Three Months Ended September 30, 2014
	Alaska
	Mainline			Regional		Horizon			Consolidating			Air Group Adjusted^(a)			Special Items^(b)			Consolidated
Operating revenues
Passenger
Mainline	$	1,030		$	—	$	—		$	—		$	1,030		$	—		$	1,030
Regional	—			219		—			—			219			—			219
Total passenger revenues	1,030			219		—			—			1,249			—			1,249
CPA revenues	—			—		99			(99		)	—			—			—
Freight and mail	30			2		—			—			32			—			32
Other - net	161			22		1			—			184			—			184
Total operating revenues	1,221			243		100			(99		)	1,465			—			1,465

Operating expenses
Operating expenses, excluding fuel	605			162		85			(97		)	755			—			755
Economic fuel	338			52		—			—			390			4			394
Total operating expenses	943			214		85			(97		)	1,145			4			1,149

Nonoperating income (expense)
Interest income	5			—		—			—			5			—			5
Interest expense	(8		)	—		(4		)	—			(12		)	—			(12		)
Other	7			—		—			—			7			—			7
	4			—		(4		)	—			—			—			—
Income before income tax	$	282		$	29	$	11		$	(2	)	$	320		$	(4	)	$	316



	Nine Months Ended September 30, 2015
	Alaska
	Mainline		Regional	Horizon		Consolidating		Air Group Adjusted^(a)		Special Items^(b)		Consolidated
Operating revenues
Passenger
Mainline	2,977		—	—		—		2,977		—		2,977
Regional	—		638	—		—		638		—		638
Total passenger revenues	2,977		638	—		—		3,615		—		3,615
CPA revenues	—		—	303		(303	)	—		—		—
Freight and mail	79		4	—		—		83		—		83
Other-net	465		55	3				523		—		523
Total operating revenues	3,521		697	306		(303	)	4,221		—		4,221

Operating expenses
Operating expenses, excluding fuel	1,951		514	274		(302	)	2,437		—		2,437
Economic fuel	641		101	—		—		742		(1	)	741
Total operating expenses	2,592		615	274		(302	)	3,179		(1	)	3,178

Nonoperating income (expense)
Interest income	15		—	—		1		16		—		16
Interest expense	(21	)	—	(8	)	(3	)	(32	)	—		(32	)
Other	21		—	—		5		26		—		26
	15		—	(8	)	3		10		—		10
Income before income tax	944		82	24		2		1,052		1		1,053



	Nine Months Ended September 30, 2014
	Alaska
	Mainline		Regional		Horizon		Consolidating		Air Group Adjusted^(a)		Special Items^(b)		Consolidated
Operating revenues
Passenger
Mainline	2,858		—		—		—		2,858		—		2,858
Regional	—		605		—		—		605		—		605
Total passenger revenues	2,858		605		—		—		3,463		—		3,463
CPA revenues	—		—		277		(277	)	—		—		—
Freight and mail	84		4		—		—		88		—		88
Other-net	448		59		4		—		511		—		511
Total operating revenues	3,390		668		281		(277	)	4,062		—		4,062

Operating expenses
Operating expenses, excluding fuel	1,783		464		257		(274	)	2,230		—		2,230
Economic fuel	980		149		—		—		1,129		(17	)	1,112
Total operating expenses	2,763		613		257		(274	)	3,359		(17	)	3,342

Nonoperating income (expense)
Interest income	15		—		—		—		15		—		15
Interest expense	(25	)	(1	)	(10	)	—		(36	)	—		(36	)
Other	34		—		—		—		34		—		34
	24		(1	)	(10	)	—		13		—		13
Income before income tax	651		54		14		(3	)	716		17		733


^(a)	The adjusted column represents the financial information that is reviewed by management to assess performance of operations and determine capital allocations and does not include certain charges.


^(b)	Includes mark-to-market fuel-hedge accounting charges.

Total assets were as follows (in millions):



	September 30, 2015			December 31, 2014
Alaska	$	7,922		$	6,772
Horizon	763			818
Parent company	4,161			3,552
Elimination of inter-company accounts	(6,282		)	(4,961		)
Consolidated	$	6,564		$	6,181