REVENUE FROM CONTRACTS WITH CUSTOMERS

6 Months Ended

Jun. 30, 2019

Ticket revenue is recorded as Passenger revenue, and represents the primary source of the Company's revenue. Also included in Passenger revenue are passenger ancillary revenues, such as bag fees, on-board food and beverage, ticket change fees, and certain revenue from the frequent flyer program. Mileage Plan other revenue includes brand and marketing revenue from our co-branded credit card and other partners and certain interline frequent flyer revenue, net of commissions. Cargo and other revenue includes freight and mail revenue, and to a lesser extent, other ancillary revenue products such as lounge membership and certain commissions.

The Company disaggregates revenue by segment in Note 9. The details within the Company’s statements of operations, segment disclosures, and in this footnote depict the nature, amount, timing and uncertainty of revenue and how cash flows are affected by economic and other factors.

Passenger Ticket and Ancillary Services Revenue

Passenger revenue recognized in the condensed consolidated statements of operations (in millions):



	Three Months Ended June 30,				Six Months Ended June 30,
	2019		2018		2019		2018
Passenger ticket revenue, including ticket breakage and net of taxes and fees	$	1,792	$	1,693	$	3,231	$	3,121
Passenger ancillary revenue	147		137		271		254
Mileage Plan passenger revenue	172		167		325		306
Total Passenger revenue	$	2,111	$	1,997	$	3,827	$	3,681

Mileage Plan™ Loyalty Program

Mileage Plan™ revenue included in the condensed consolidated statements of operations (in millions):



	Three Months Ended June 30,				Six Months Ended June 30,
	2019		2018		2019		2018
Passenger revenue	$	172	$	167	$	325	$	306
Mileage Plan other revenue	118		108		228		215
Total Mileage Plan revenue	$	290	$	275	$	553	$	521

Cargo and Other

Cargo and other revenue included in the condensed consolidated statements of operations (in millions):



	Three Months Ended June 30,				Six Months Ended June 30,
	2019		2018		2019		2018
Cargo revenue	$	38	$	34	$	68	$	60
Other revenue	21		17		41		32
Total Cargo and other revenue	$	59	$	51	$	109	$	92

Air Traffic Liability and Deferred Revenue

Passenger ticket and ancillary services liabilities

The Company recognized Passenger revenue of $89 million and $79 million from the prior year-end air traffic liability balance for the three months ended June 30, 2019 and 2018, and $563 million and $513 million for the six months ended June 30, 2019 and 2018.

Mileage Plan^TM liabilities

The Company records a receivable for amounts due from the bank partner and from other partners as mileage credits are sold until the payments are collected. The Company had $122 million of such receivables as of June 30, 2019 and $119 million as of December 31, 2018.

The table below presents a roll forward of the total frequent flyer liability (in millions):



	Six Months Ended June 30,
	2019			2018
Total Deferred Revenue balance at January 1	$	1,874		$	1,725
Travel miles and companion certificate redemption - Passenger revenue	(325		)	(306		)
Miles redeemed on partner airlines - Other revenue	(51		)	(44		)
Increase in liability for mileage credits issued	451			402
Total Deferred Revenue balance at June 30	$	1,949		$	1,777