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Revenue Recognition (Tables) | 12 Months Ended
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Dec. 31, 2023
Revenue from Contract with Customer [Abstract] |
Disaggregation of revenue | The following table provides revenue recognized by revenue source for the years ended December 31, 2023, 2022, and 2021 (in millions):
|  | Twelve Months Ended December 31,
|  | 2023 |  | 2022 |  | 2021
Passenger revenue |  |  |  |  |  |
Passenger travel |  | $ | 8,403 |  |  | $ | 8,078 |  |  | $ | 5,304 |
Loyalty revenue - air transportation |  | 605 |  |  | 508 |  |  | 305 |
Other revenue |  |  |  |  |  |
Loyalty revenue |  | 422 |  |  | 391 |  |  | 306 |
Other revenue |  | 185 |  |  | 181 |  |  | 122 |
Total operating revenue |  | $ | 9,615 |  |  | $ | 9,158 |  |  | $ | 6,037 |
Contract with customer, contract asset, contract liability, and receivable | Our contract liabilities primarily consist of ticket sales for which transportation has not yet been provided, unused credits available to customers, and outstanding loyalty points available for redemption (in millions):
|  | December 31, 2023 |  | December 31, 2022
Air traffic liability - passenger travel |  | $ | 1,099 |  |  | $ | 1,291 |
Air traffic liability - loyalty program (air transportation) |  | 1,072 |  |  | 1,000 |
Deferred revenue (1) |  | 487 |  |  | 530 |
Total |  | $ | 2,658 |  |  | $ | 2,821 |
(1) Deferred revenue is included within other accrued liabilities and other liabilities on our consolidated balance sheets. The table below presents the activity of the current and non-current air traffic liability for our loyalty program, and includes points earned and sold to participating companies for the years ended December 31, 2023 and 2022 (in millions):
Balance at December 31, 2021 | $ | 891 |
TrueBlue® points redeemed passenger | (508) |
TrueBlue® points earned and sold | 617 |
Balance at December 31, 2022 | 1,000 |
TrueBlue® points redeemed passenger | (605) |
TrueBlue® points redeemed other | (24) |
TrueBlue® points earned and sold | 701 |
Balance at December 31, 2023 | $ | 1,072 |

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- Definition Tabular disclosure of receivable, contract asset, and contract liability from contract with customer. Includes, but is not limited to, change in contract asset and contract liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-10 + Details
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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-5 + Details
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