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Revenue
 3 Months Ended
Mar. 31, 2025
Revenue from Contract with Customer [Abstract]  
REVENUE REVENUE
Passenger Revenues
The Company’s contracts with its Customers primarily consist of its tickets sold, which are initially deferred as Air traffic liability. Passenger revenue associated with tickets is recognized when the performance obligation to the Customer is satisfied, which is primarily when travel is provided. For air travel on Southwest, the amount of tickets (which includes flight credits—also referred to as partial tickets) that will go unused, referred to as breakage, is estimated and recognized in Passenger revenue once the scheduled flight date has passed.

Revenue is categorized by revenue source as the Company believes it best depicts the nature, amount, timing, and uncertainty of revenue and cash flow. The following table provides the components of Passenger revenue recognized for the three months ended March 31, 2025 and 2024:
 Three months ended March 31,
(in millions)20252024
Passenger non-loyalty$4,766 $4,680 
Passenger loyalty - air transportation800 799 
Passenger ancillary sold separately245 233 
Total passenger revenues$5,811 $5,712 

As of March 31, 2025, and December 31, 2024, the components of Air traffic liability, including contract liabilities based on tickets sold and unused flight credits available to the Customer, both of which are net of recorded breakage, and loyalty points available for redemption, within the unaudited Condensed Consolidated Balance Sheet were as follows:
 Balance as of
(in millions)March 31, 2025December 31, 2024
Air traffic liability - passenger travel and ancillary passenger services$4,061 $3,393 
Air traffic liability - loyalty program4,841 4,849 
Total Air traffic liability$8,902 $8,242 

The balance in Air traffic liability - passenger travel and ancillary passenger services also includes flight credits not currently associated with a ticket that can be applied by Customers towards the purchase of future travel. These flight credits are typically created as a result of a prior ticket cancellation or exchange, and are recorded net of associated breakage. Rollforwards of the Company's Air traffic liability - loyalty program for the three months ended March 31, 2025 and 2024 were as follows:

Three months ended March 31,
(in millions)20252024
Air traffic liability - loyalty program - beginning balance$4,849 $4,916 
Amounts deferred associated with points awarded817 893 
Revenue recognized from points redeemed - Passenger(800)(799)
Revenue recognized from points redeemed - Other(25)(23)
Air traffic liability - loyalty program - ending balance$4,841 $4,987 

Air traffic liability includes consideration received for ticket and loyalty related performance obligations which have not been satisfied as of a given date. Rollforwards of the amounts included in Air traffic liability as of March 31, 2025 and 2024 were as follows:
Three months ended March 31,
(in millions)20252024
Air traffic liability - beginning balance$8,242 $8,279 
Current period sales (a)6,471 6,850 
Revenue from amounts included in contract liability opening balances(2,608)(2,557)
Revenue from current period sales(3,203)(3,178)
Air traffic liability - ending balance$8,902 $9,394 
(a)Current period sales include passenger travel, ancillary services, flight loyalty, and partner loyalty

Under the Company's current policy, flight credits never expire. However, as the Company believes that a portion of Customer flight credits issued will not be redeemed, it estimates and records breakage associated with such amounts. Customer flight credits represent approximately 7 percent and 8 percent of the total Air traffic liability balance as of March 31, 2025, and December 31, 2024, respectively. On March 11, 2025, the Company announced a change to its flight credit policy. Flight credits issued for reservations booked and ticketed or changed on or after May 28, 2025, will have a specified expiration date.

The Company recognizes revenue related to the marketing, advertising, and other travel-related benefits of the cash receipts associated with various loyalty partner agreements including, but not limited to, its co-branded credit card agreement with Chase Bank USA, N.A. (“Chase”). For the three months ended March 31, 2025 and 2024, the Company recognized $569 million and $542 million of such revenue, respectively, the majority of which is within Other operating revenues.
Through the co-branded credit card agreement with Chase, the Company sells loyalty points, certain marketing benefits, which consist of the use of the Southwest Airlines brand and access to Rapid Rewards Member lists, licensing and advertising elements, and the use of the Company’s resource team, and other airline benefits. The Company allocates consideration received to performance obligations based on the relative fair value of those obligations. In first quarter 2025, the Company and Chase executed an amendment to the co-branded credit card agreement that extended the term of the agreement and added enhanced airline benefits for Cardmembers associated with the Company's planned assigned and premium seating initiative. The Company estimated the selling prices and volumes over the term of the amended agreement in order to determine the allocation of proceeds to each of the three performance obligations identified in the agreement, which have been characterized as a transportation component, a marketing component, and an airline benefits component. The Company records Passenger revenue related to loyalty point redemptions for air travel when the travel is delivered, the marketing elements are recognized as Other revenue when the performance obligations related to those services are satisfied, which is generally the same period consideration is received from Chase, and the airline benefits are recognized as Passenger revenue when they are provided.