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Revenue
 6 Months Ended
Jun. 30, 2024
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 June 30,Six Months Ended June 30,
2024202320242023
Domestic (U.S. and Canada)$8,761 $8,417 $16,434 $15,584 
Atlantic3,277 3,229 5,110 5,061 
Latin America1,346 1,273 2,791 2,589 
Pacific1,602 1,259 3,190 2,373 
Total$14,986 $14,178 $27,525 $25,607 
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 estimates the value of Advance ticket sales that will expire unused ("breakage") and recognizes revenue and any changes in estimates 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.
In the six months ended June 30, 2024 and 2023, the Company recognized approximately $5.0 billion and $4.6 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. This includes fees for baggage, premium seats, inflight amenities 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 $1.2 billion and $2.2 billion of ancillary fees within passenger revenue in the three and six months ended June 30, 2024, respectively. The Company recorded $1.0 billion and $1.9 billion of ancillary fees within passenger revenue in the three and six months ended June 30, 2023, respectively.
Frequent Flyer Accounting. The table below presents a roll forward of Frequent flyer deferred revenue (in millions):
Three Months Ended June 30,Six Months Ended June 30,
2024202320242023
Total Frequent flyer deferred revenue - beginning balance$7,279 $6,860 $7,143 $6,675 
Total miles awarded919 902 1,759 1,649 
Travel miles redeemed(818)(712)(1,483)(1,243)
Non-travel miles redeemed(27)(26)(66)(57)
Total Frequent flyer deferred revenue - ending balance$7,353 $7,024 $7,353 $7,024 
In the three and six months ended June 30, 2024, the Company recognized, in Other operating revenue, $0.7 billion and $1.5 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 $0.7 billion and $1.3 billion, respectively, in the three and six months ended June 30, 2023, 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 our estimate of expected redemptions in the next 12 months.