Spirit Airlines officially filed for Chapter 11 bankruptcy protection on Monday, marking a significant restructuring effort for the pioneer of budget air travel in the United States. The filing follows years of mounting losses, a failed merger with JetBlue Airways, and looming debt deadlines. In a statement to customers, the airline emphasized that flight operations, ticket sales, and loyalty programs remain unaffected and will continue as scheduled throughout the process. Industry analysts point to rising labor costs and a saturated low-fare market as primary contributors to the carrier's financial distress. Spirit aims to emerge from the court-supervised process by early 2025, having reached an agreement with bondholders to reduce its debt load and provide fresh capital to sustain operations.