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Revenue Recognition (Tables) | 12 Months Ended
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Dec. 31, 2021
Revenue from Contract with Customer [Abstract] |
Disaggregation of revenue | The following table provides the revenue recognized by revenue source for the years ended December 31, 2021, 2020, and 2019 (in millions):
|  | 2021 |  | 2020 |  | 2019
Passenger revenue |  |  |  |  |  |
Passenger travel |  | $ | 5,304 |  |  | $ | 2,551 |  |  | $ | 7,395 |
Loyalty revenue - air transportation |  | 305 |  |  | 182 |  |  | 391 |
Other revenue |  |  |  |  |  |
Loyalty revenue |  | 306 |  |  | 168 |  |  | 201 |
Other revenue |  | 122 |  |  | 56 |  |  | 107 |
Total revenue |  | $ | 6,037 |  |  | $ | 2,957 |  |  | $ | 8,094 |
Contract with customer, asset and liability | 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, 2021 |  | December 31, 2020
Air traffic liability - passenger travel |  | $ | 1,323 |  |  | $ | 964 |
Air traffic liability - loyalty program (air transportation) |  | 891 |  |  | 733 |
Deferred revenue(1) |  | 613 |  |  | 92 |
Total |  | $ | 2,827 |  |  | $ | 1,789 |
(1) Deferred revenue is included within other accrued liabilities and other liabilities on our consolidated balance sheets. The increase in deferred revenue was attributed to the initial cash payments received from our new Co-Branded Credit Card agreements which are deferred and recognized as revenue over the terms of the related contracts. 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 (in millions):
Balance at December 31, 2019 | $ | 661 |
TrueBlue® points redeemed | (182) |
TrueBlue® points earned and sold | 254 |
Balance at December 31, 2020 | 733 |
TrueBlue® points redeemed | (305) |
TrueBlue® points earned and sold | 463 |
Balance at December 31, 2021 | $ | 891 |

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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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