Spirit Airlines said Monday that it has filed for bankruptcy protection and will attempt to reboot as it struggles to recover from the pandemic-caused swoon in travel, stiffer competition from bigger carriers, and a failed attempt to sell the airline to JetBlue. Spirit, the biggest U.S. budget airline, filed a Chapter 11 bankruptcy petition after working out terms with bondholders. The airline has lost more than $2.5 billion since the start of 2020 and faces looming debt payments totaling more than $1 billion in 2025 and 2026. MORE: https://www.wthr.com/article/news/nation-world/spirit-airlines-bankruptcy/507-f4abb4a6-8974-42d9-8a5d-c3e84d5309c6