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Revenue Recognition (Tables) | 6 Months Ended
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Jun. 30, 2022
Revenue from Contract with Customer [Abstract] |
Disaggregation of revenue | The following table provides the revenues recognized by revenue source for the three and six months ended June 30, 2022 and 2021 (in millions):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2022 |  | 2021 |  | 2022 |  | 2021
Passenger revenue |  |  |  |  |  |  |
Passenger travel | $ | 2,162 |  |  | $ | 1,322 |  |  | $ | 3,651 |  |  | $ | 1,945 |
Loyalty revenue - air transportation | 140 |  |  | 66 |  |  | 253 |  |  | 113 |
Other revenue |  |  |  |  |  |  |
Loyalty revenue | 95 |  |  | 81 |  |  | 184 |  |  | 126 |
Other revenue | 48 |  |  | 30 |  |  | 93 |  |  | 48 |
Total revenue | $ | 2,445 |  |  | $ | 1,499 |  |  | $ | 4,181 |  |  | $ | 2,232 |
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):
| June 30, 2022 |  | December 31, 2021
Air traffic liability - passenger travel | $ | 1,690 |  |  | $ | 1,323 |
Air traffic liability - loyalty program (air transportation) | 927 |  |  | 891 |
Deferred revenue(1) | 571 |  |  | 613 |
Total | 3,188 |  |  | 2,827 |
(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 six months ended June 30, 2022 and 2021 (in millions):
Balance at December 31, 2021 | $ | 891 |
TrueBlue® points redeemed | (253) |
TrueBlue® points earned and sold | 289 |
Balance at June 30, 2022 | $ | 927 |
Balance at December 31, 2020 | $ | 733 |
TrueBlue® points redeemed | (113) |
TrueBlue® points earned and sold | 186 |
Balance at June 30, 2021 | $ | 806 |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130551-203045 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130545-203045 + Details
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