Credit Card Processing Arrangements	12 Months Ended
Credit Card Processing Arrangements	Dec. 31, 2024
Credit Card Processing Arrangements [Abstract]
Credit Card Processing Arrangements	Credit Card Processing Arrangements The Company has agreements with organizations that process credit card transactions arising from the purchase of air travel, baggage charges and other ancillary services by customers. As it is standard in the airline industry, the Company's contractual arrangements with credit card processors permit them, under certain circumstances, to retain a holdback or other collateral, when future air travel and other future services are purchased via credit card transactions. The required holdback is the amount of the Company's overall credit card sales that its credit card processors hold to cover refunds to customers if the Company fails to fulfill its flight obligations. The Company's credit card processors do not require the Company to maintain cash collateral provided that the Company satisfies certain liquidity and other financial covenants. Failure to meet these covenants would provide the processors the right to place a holdback, resulting in a commensurate reduction of unrestricted cash. The maximum potential exposure to cash holdbacks by the Company's credit card processors, based upon advance ticket sales and Spirit Saver$ Club® memberships as of December 31, 2024 and 2023, was $469.2 million and $408.3 million, respectively. On July 2, 2024, the Company entered into a letter agreement with its primary credit card processor that modified its existing agreement to, among other things, extend the term until December 31, 2025, including automatic extensions for two successive one-year terms (subject to the right of either party to opt out of any extension term by written notice to the other within a specified period of time prior to the commencement of any extension term); provided that if the Company’s senior secured notes due 2025 are not extended or refinanced by September 20, 2024 (the “2025 Notes Extension Deadline”), in a specified minimum outstanding principal amount thereof, then the term will revert to December 31, 2024 (the “Early Maturity Date”). Based on the terms of the agreement, in July 2024, the Company deposited $200.0 million into a deposit account and deposited $50.0 million into a restricted account. The $200.0 million deposited into the deposit account is considered a compensating balance arrangement that does not legally restrict the Company's use of this cash. As such, the balance of the deposit account is included in cash and cash equivalents within the Company's consolidated balance sheets, and the $50.0 million in the restricted account is included in restricted cash within the Company's consolidated balance sheets going forward. On September 9, 2024, the Company entered into a letter agreement which modified its existing credit card processing agreement to extend the 2025 Notes Extension Deadline from September 20, 2024 to October 21, 2024. On October 11, 2024, the Company entered into a letter agreement (the “Credit Card Processing Amendment”) which modified its existing credit card processing agreement to extend (i) the 2025 Notes Extension Deadline from October 21, 2024 to December 23, 2024 and (ii) the Early Maturity Date from December 31, 2024 to March 3, 2025. Pursuant to the Credit Card Processing Amendment, the filing of the Chapter 11 Cases on November 18, 2024 constitutes a breach of contract, subject to the automatic stay resulting from the Chapter 11 Cases. However, as of December 31, 2024 and 2023, the Company was in compliance with other liquidity and other financial covenants in its credit card processing agreement. For additional information on the Company's bankruptcy proceedings and its related automatic stay and other protections, refer to Note 3, Chapter 11 Proceedings. Additionally, the Company provided a $20.7 million deposit to a credit card processor recorded within deposits and other current assets in its consolidated balance sheets.