A Spirit Airlines Airbus A320 taxis at Los Angeles International Airport after arriving from Boston on September 1, 2024 in Los Angeles, California.Spirit Airlines on Friday filed for bankruptcy protection, just months after the budget carrier failed to secure better financial footing when it came out of Chapter 11 protection in March.Spirit debtholders agreed in its previous bankruptcy, which began in November, to exchange debt for equity, but the carrier avoided bigger changes to cut costs, like getting r ...