If your holiday plans involved flying Spirit Airlines, which declared bankruptcy on Monday, there's no need to panic. The airline, burdened with $3.1 billion in long-term debt based on regulatory filings, has assured customers it will maintain normal operations during this transitional phase. “Passengers can continue to book and travel as usual, and all tickets, credits, and loyalty points remain valid,” Spirit announced in a press release. However, changes could emerge in the coming