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Revenue
 9 Months Ended
Sep. 30, 2023
Revenue from Contract with Customer [Abstract]  
REVENUE REVENUE
Revenue by Geography. The table below presents the Company's operating revenue by principal geographic region (as defined by the U.S. Department of Transportation) (in millions):
Three Months Ended September 30,Nine Months Ended
September 30,
2023202220232022
Domestic (U.S. and Canada)$8,379 $7,718 $23,963 $20,623 
Atlantic3,543 3,186 8,604 6,756 
Latin America1,184 1,162 3,773 3,266 
Pacific1,378 811 3,751 1,910 
Total$14,484 $12,877 $40,091 $32,555 
Advance Ticket Sales. The Company defers amounts related to future travel in its Advance ticket sales liability account. All tickets sold at any given point in time have travel dates through the next 12 months. The Company's Advance ticket sales liability also includes credits issued to customers for future flights ("FFCs") and electronic travel certificates ("ETCs"), primarily for ticket cancellations, which can be applied towards a purchase of a new ticket. FFCs and ETCs are valid up to one year from the date of issuance; however, all credits issued on or before December 31, 2022 have been extended to December 31, 2023.
The Company estimates the value of Advance ticket sales that will expire unused ("breakage") and recognizes revenue in proportion to the usage of the related tickets. To determine breakage, the Company uses its historical experience with expired tickets and certificates and other facts, such as recent aging trends, program changes and modifications that could affect the ultimate expiration patterns. Changes in our estimates of FFCs and ETCs that may expire unused could have a material impact on revenue. Changes in estimates of breakage are recognized prospectively in proportion to the remaining usage of the related tickets.
In the nine months ended September 30, 2023 and 2022, the Company recognized approximately $5.3 billion and $3.0 billion, respectively, of passenger revenue for tickets that were included in Advance ticket sales at the beginning of those periods.
Ancillary Fees. The Company charges fees, separately from ticket sales, for certain ancillary services that are directly related to passengers' travel, such as baggage fees, premium seat fees, inflight amenity 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 $1.1 billion and $3.0 billion of ancillary fees within passenger revenue in the three and nine months ended
September 30, 2023, respectively. The Company recorded $0.9 billion and $2.4 billion of ancillary fees within passenger revenue in the three and nine months ended September 30, 2022, respectively.
Frequent Flyer Accounting. The table below presents a roll forward of Frequent flyer deferred revenue (in millions):
Three Months Ended September 30,Nine Months Ended
September 30,
2023202220232022
Total Frequent flyer deferred revenue - beginning balance$7,024 $6,495 $6,675 $6,282 
Total miles awarded816 705 2,465 1,848 
Travel miles redeemed(740)(601)(1,983)(1,489)
Non-travel miles redeemed(24)(21)(81)(63)
Total Frequent flyer deferred revenue - ending balance$7,076 $6,578 $7,076 $6,578 
In the three and nine months ended September 30, 2023, the Company recognized, in Other operating revenue, $0.7 billion and $2.0 billion, 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 JPMorgan Chase Bank, N.A. MileagePlus co-brand agreement. The Company recognized $0.6 billion and $1.7 billion, respectively, in the three and nine months ended September 30, 2022, related to those agreements. 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 deferred revenue. We determine the current portion of that account based on expected redemptions in the next 12 months.