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If Spirit Airlines goes out of business, your tickets with the carrier would become worthless. Loading audio narration… That’s the risk hanging over the ultra-low-cost carrier as it searches for a buyer but has yet to secure a deal. The airline has struggled for years to turn a profit amid…

Travelers checking in at United Airlines' Premier Access desk at Chicago's O'Hare Airport.JOSHUA LOTT/AFP via Getty ImagesSome passengers have figured out a way to get through TSA fast.Passengers told Business Insider they shelled out for first-class tickets to get past snaking lines.Several airlines do offer first-class passengers expedited priority lines…