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Revenue Recognition (Tables) | 6 Months Ended
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Jun. 30, 2021
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, 2021 and 2020 (in millions):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Passenger revenue |  |  |  |  |  |  |
Passenger travel | $ | 1,322 |  |  | $ | 145 |  |  | $ | 1,945 |  |  | $ | 1,553 |
Loyalty revenue - air transportation | 66 |  |  | 25 |  |  | 113 |  |  | 129 |
Other revenue |  |  |  |  |  |  |
Loyalty revenue | 81 |  |  | 38 |  |  | 126 |  |  | 88 |
Other revenue | 30 |  |  | 7 |  |  | 48 |  |  | 33 |
Total revenue | $ | 1,499 |  |  | $ | 215 |  |  | $ | 2,232 |  |  | $ | 1,803 |
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, 2021 |  | December 31, 2020
Air traffic liability - passenger travel | $ | 1,628 |  |  | $ | 964 |
Air traffic liability - loyalty program and deferred revenue | 1,350 |  |  | 825 |
Total | 2,978 |  |  | 1,789 |
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, 2021 and 2020 (in millions):
Balance at December 31, 2020 | $ | 733 |
TrueBlue® points redeemed | (113) |
TrueBlue® points earned and sold | 186 |
Balance at June 30, 2021 | $ | 806 |
Balance at December 31, 2019 | $ | 661 |
TrueBlue® points redeemed | (129) |
TrueBlue® points earned and sold | 144 |
Balance at June 30, 2020 | $ | 676 |
The timing of our TrueBlue® point redemptions can vary; however, the majority of our points are redeemed within approximately three years of the date of issuance.

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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 http://asc.fasb.org/extlink&oid=123351226&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 http://asc.fasb.org/extlink&oid=123351226&loc=SL49130545-203045 + Details
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