REVENUE

Revenue by Geography. The following table presents operating revenue by geographic region (in millions):



	Three Months Ended March 31,
	2019		2018
Domestic (U.S. and Canada)	$	5,875	$	5,476
Atlantic	1,458		1,389
Pacific	1,281		1,231
Latin America	975		936
Total	$	9,589	$	9,032

Ancillary Fees. The Company charges fees, separately from ticket sales, for certain ancillary services that are directly related to passengers' travel, such as ticket change fees, baggage fees, inflight amenities fees, and other ticket-related fees. These ancillary fees are part of the travel performance obligation and, as such, are recognized as passenger revenue when the travel occurs. The Company recorded $571 million and $497 million of ancillary fees within passenger revenue in the three months ended March 31, 2019 and 2018, respectively.

Advance Ticket Sales. All tickets sold at any given point of time have travel dates extending up to twelve months. The Company defers amounts related to future travel in its Advance ticket sales liability account. As a result, the balance of the Company's Advance ticket sales liability represents activity that will be recognized in the next twelve months. In the three months ended March 31, 2019 and 2018, the Company recognized approximately $2.7 billion and $2.5 billion, respectively, of passenger revenue for tickets that were included in Advance ticket sales at the beginning of those periods.

Frequent Flyer Accounting. The table below presents a roll forward of Frequent flyer deferred revenue (in millions):



	Three Months Ended March 31,
	2019			2018
Total Frequent flyer deferred revenue - beginning balance	$	5,005		$	4,783
Miles awarded	607			603
Travel miles redeemed (Passenger revenue)	(438		)	(409		)
Non-travel miles redeemed (Other operating revenue)	(36		)	(40		)
Total Frequent flyer deferred revenue - ending balance	$	5,138		$	4,937

In the three months ended March 31, 2019 and 2018, the Company recognized, in Other operating revenue, $473 million and $494 million, respectively, related to the marketing, advertising, non-travel miles redeemed (net of related costs) and other travel-related benefits of the mileage revenue associated with our various partner agreements including, but not limited to, our Chase co-brand agreement. The portion related to the MileagePlus miles awarded of the total amounts received from our various partner agreements is deferred and presented in the table above as an increase to the frequent flyer liability.