Key Takeaways Shares of discount airlines Frontier Group Holdings and JetBlue soared on a report that rival Spirit Airlines is holding discussions about a possible bankruptcy. The Wall Street Journal said Spirit is holding talks with bondholders and other creditors about a Chapter 11 filing. Spirit Airlines shares spiraled on the news, hitting an all-time low. Shares of Frontier Group Holdings (ULCC) and JetBlue Airways (JBLU) took off Friday on a report that discount airline rival Spirit Airlines (SAVE) is ...