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Revenue
 6 Months Ended
Jun. 30, 2022
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,
2022202120222021
Domestic (U.S. and Canada)$7,819 $3,767 $12,905 $5,878 
Atlantic2,481 585 3,570 995 
Latin America1,195 727 2,104 1,119 
Pacific617 392 1,099 700 
Total$12,112 $5,471 $19,678 $8,692 
Advance Ticket Sales. All tickets sold at any given point in time have travel dates through the next 12 months. The Company defers amounts related to future travel in its Advance ticket sales liability account. The Company's Advance ticket sales liability also includes credits issued to customers on electronic travel certificates ("ETCs") and future flight credits ("FFCs"), primarily for ticket cancellations, which can be applied towards a purchase of a new ticket. ETCs are valid up to one year from the date of issuance; however, all ETCs issued on or before December 31, 2022 have been extended to December 31, 2023. FFCs are valid for 12 months from the original ticket date; however, all FFCs issued on or before December 31, 2022 have been extended to December 31, 2023. The Company is unable to estimate the amount of the ETCs and FFCs that will be used within the next 12 months and has classified the entire amount of the Advance ticket sales liability in current liabilities even though some of the ETCs and FFCs could be used after the next 12 months.
The Company estimates the value of Advance tickets sales that will expire unused ("breakage") and recognizes revenue at the scheduled flight date. To determine breakage, the Company uses its historical experience with expired tickets and other facts, such as recent aging trends, program changes and modifications that could affect the ultimate expiration patterns of tickets. Given the uncertainty of travel demand caused by the novel coronavirus ("COVID-19") pandemic, changes in our estimates of ETCs and FFCs that may expire unused could have a significant impact on revenue. Changes in estimates of breakage are recognized prospectively in proportion to the remaining usage of the related tickets.
In the three and six months ended June 30, 2022, the Company recognized approximately $4.2 billion and $2.6 billion, respectively, of passenger revenue for tickets that were included in Advance ticket sales at the beginning of those periods. In the three and six months ended June 30, 2021, the Company recognized approximately $1.5 billion and $1.4 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 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 $0.9 billion and $1.5 billion of ancillary fees within passenger revenue in the three and six months ended June 30, 2022, respectively. The Company recorded $0.5 billion and $0.8 billion of ancillary fees within passenger revenue in the three and six months ended June 30, 2021, 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,
2022202120222021
Total Frequent flyer deferred revenue - beginning balance$6,417 $6,109 $6,282 $5,975 
Total miles awarded666 360 1,143 632 
Travel miles redeemed(566)(267)(888)(390)
Non-travel miles redeemed(22)(17)(42)(32)
Total Frequent flyer deferred revenue - ending balance$6,495 $6,185 $6,495 $6,185 
In the three and six months ended June 30, 2022, the Company recognized, in Other operating revenue, $0.6 billion and $1.1 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. co-brand agreement. The Company recognized $0.4 billion and $0.8 billion, respectively, in the three and six months ended June 30, 2021, 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 liability. We determine the current portion of our frequent flyer liability based on expected redemptions in the next 12 months