Spirit Airlines, once a prominent budget carrier in the U.S., is preparing to cease all flight operations after failing to secure a crucial $500 million federal rescue deal. The airline's financial troubles have been exacerbated by two bankruptcy filings in less than two years, a blocked merger with JetBlue, and rising operational costs due to soaring jet fuel prices amid the ongoing Iran conflict. As a result, Spirit's business model, which relies on ultra-thin profit margins, has become unsustainable. The airline's shutdown will likely lead to increased ticket prices across the industry, as larger carriers like Delta and United may raise fares in the absence of Spirit's competitive pricing. Travelers currently holding Spirit tickets are urged to contact their credit card companies to explore chargeback options, as the airline's operations could cease without warning. The situation underscores the vulnerability of low-cost airlines and their significant role in keeping airfares affordable for millions of Americans.