OPERATING SEGMENT INFORMATION (Tables)

12 Months Ended

Dec. 31, 2020

Segment Reporting, Asset Reconciling Item [Line Items]

Schedule of Segment Reporting Information, by Segment

Operating segment information is as follows (in millions):

	Year Ended December 31, 2020
	Mainline		Regional		Horizon		Consolidating & Other(a)		Air Group Adjusted(b)		Special Items(c)		Consolidated
Operating Revenues
Passenger revenues	2,350		669		—		—		3,019		—		3,019
CPA revenues	—		—		386		(386)		—		—		—
Mileage Plan other revenue	309		65		—		—		374		—		374
Cargo and other	170		—		—		3		173		—		173
Total Operating Revenues	2,829		734		386		(383)		3,566		—		3,566
Operating Expenses
Non-fuel operating expenses	3,630		993		323		(399)		4,547		71		4,618
Fuel expense	569		162		—		—		731		(8)		723
Total Operating Expenses	4,199		1,155		323		(399)		5,278		63		5,341
Total Non-operating Income (Expense)	(19)		—		(22)		2		(39)		(26)		(65)
Income (Loss) Before Income Tax	$	(1,389)	$	(421)	$	41	$	18	$	(1,751)	$	(89)	$	(1,840)

	Year Ended December 31, 2019
	Mainline		Regional		Horizon		Consolidating & Other(a)		Air Group Adjusted(b)		Special Items(c)		Consolidated
Operating Revenues
Passenger revenues	6,750		1,345		—		—		8,095		—		8,095
CPA revenues	—		—		450		(450)		—		—		—
Mileage Plan other revenue	419		46		—		—		465		—		465
Cargo and other	212		3		1		5		221		—		221
Total Operating Revenues	7,381		1,394		451		(445)		8,781		—		8,781
Operating Expenses
Non-fuel operating expenses	4,778		1,097		385		(464)		5,796		44		5,840
Fuel expense	1,589		295		—		—		1,884		(6)		1,878
Total Operating Expenses	6,367		1,392		385		(464)		7,680		38		7,718
Total Non-operating Income (Expense)	(21)		—		(28)		2		(47)		—		(47)
Income (Loss) Before Income Tax	$	993	$	2	$	38	$	21	$	1,054	$	(38)	$	1,016

	Year Ended December 31, 2018
	Mainline		Regional		Horizon		Consolidating & Other(a)		Air Group Adjusted(b)		Special Items(c)		Consolidated
Operating Revenues
Passenger revenues	6,474		1,157		—		—		7,631		—		7,631
CPA revenues	—		—		508		(508)		—		—		—
Mileage Plan other revenue	397		37		—		—		434		—		434
Cargo and other	192		3		4		—		199		—		199
Total Operating Revenues	7,063		1,197		512		(508)		8,264		—		8,264
Operating Expenses
Non-fuel operating expenses	4,577		1,024		465		(513)		5,553		132		5,685
Fuel expense	1,652		262		—		—		1,914		22		1,936
Total Operating Expenses	6,229		1,286		465		(513)		7,467		154		7,621
Total Non-operating Income (Expense)	(25)		(11)		(20)		(2)		(58)		—		(58)
Income (Loss) Before Income Tax	$	809	$	(100)	$	27	$	3	$	739	$	(154)	$	585

(a)Includes consolidating entries, Parent Company, McGee Air Services, and other immaterial business units.

(b)The Air Group Adjusted column represents the financial information that is reviewed by management to assess performance of operations and determine capital allocations and excludes certain income and charges.

(c)Includes payroll support program grant wage offsets, special items and mark-to-market fuel-hedge accounting adjustments.

	2020		2019		2018
Depreciation and amortization:
Mainline	$	346	$	337	$	316
Horizon	74		86		82
Consolidated	$	420	$	423	$	398
Capital expenditures:
Mainline	$	194	$	605	$	571
Horizon	12		91		389
Consolidated	$	206	$	696	$	960
Total assets at end of period:
Mainline	$	19,754	$	19,207
Horizon	1,170		1,266
Consolidating & Other	(6,878)		(7,480)
Consolidated	$	14,046	$	12,993