Spirit Airlines is an American ultra-low-cost carrier (ULCC) headquartered in Miramar, Florida. Founded in 1983 as Charter One Airlines, it rebranded as Spirit Airlines in 1992 and transitioned to a scheduled airline model, eventually adopting the ULCC structure characterized by unbundled fares and optional add-on fees. The airline operates an extensive network of domestic and international routes, serving destinations across the United States, the Caribbean, Latin America, and Mexico. Spirit is known for its distinctive yellow aircraft livery and its bare-bones 'Bare Fare' pricing philosophy, which keeps base ticket prices low while charging separately for extras such as carry-on bags, seat selection, and snacks. Spirit filed for Chapter 11 bankruptcy protection in November 2024 after a series of failed merger attempts, including a blocked acquisition by Frontier Airlines and a rejected bid from JetBlue Airways. The airline continued operations during bankruptcy proceedings while restructuring its finances.