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Revenue Recognition | 12 Months Ended
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Dec. 31, 2023
Revenue from Contract with Customer [Abstract] |
Revenue Recognition | Revenue Recognition Passenger revenue Passenger revenue is the most significant category in the Company's reported operating revenues, as outlined below:
| Year Ended December 31,
(in thousands) | 2023 |  | 2022 |  | 2021
Scheduled service | $ | 1,133,001 |  |  | $ | 1,062,753 |  |  | $ | 769,371 |
Ancillary air-related charges | 1,137,226 |  |  | 1,025,549 |  |  | 788,064 |
Loyalty redemptions | 54,170 |  |  | 49,460 |  |  | 21,001 |
Total passenger revenue | $ | 2,324,397 |  |  | $ | 2,137,762 |  |  | $ | 1,578,436 |
Sales of passenger tickets not yet flown are recorded in air traffic liability. Passenger revenue is recognized when transportation is provided. As of December 31, 2023, the air traffic liability balance was $353.5 million, of which approximately $303.6 million was related to forward bookings, with the remaining $49.9 million related to credit vouchers for future travel. The normal contract term of passenger tickets is 12 months and passenger revenue associated with future travel will principally be recognized within this time frame. Of the $379.5 million that was recorded in the air traffic liability balance at December 31, 2022, substantially all was recognized into passenger revenue during the 12 months ended December 31, 2023. In 2020, the Company announced that credit vouchers issued for canceled travel beginning in January 2020 would have an extended expiration date of two years from the original booking date. This policy continued for credit vouchers issued through June 30, 2021. Estimates of passenger revenue to be recognized from air traffic liability for credit voucher breakage during this period may be subject to variability and differ from historical experience due to the change in contract duration and uncertainty regarding demand for future air travel. Effective July 1, 2021, vouchers issued have an expiration date of one year from the original booking date. The Company periodically evaluates the estimated amount of credit vouchers expected to expire unused and any adjustment is removed from air traffic liability and included in passenger revenue in the period in which the evaluation is complete. Loyalty redemptions The following table presents the activity of the co-brand credit card and the loyalty program as of the dates indicated:
| Year Ended December 31,
(in thousands) | 2023 |  | 2022
Balance at January 1 | $ | 56,500 |  |  | $ | 40,449 |
Points awarded | 68,483 |  |  | 65,511 |
Points redeemed | (54,170) |  |  | (49,460) |
Balance at December 31 | $ | 70,813 |  |  | $ | 56,500 |
The current portion of the loyalty program liability represents the estimate of revenue to be recognized in the next 12 months based on historical trends, with the remaining balance reflected in other noncurrent liabilities and expected to be recognized into revenue in periods thereafter.

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- Definition The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-9 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -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 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-15 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-12 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-12 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-12 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-12 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-12 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (b)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-13 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Topic 606 -Publisher FASB -URI https://asc.fasb.org//606/tableOfContent + Details
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