Spirit Airlines rejected an acquisition offer worth about $2.16 billion from Frontier Group.Spirit and Frontier have been in merger talks since at least 2022, even before Spirit filed for bankruptcy in 2024.Spirit Airlines filed for bankruptcy due to prolonged periods of financial losses and a substantial debt load. Spirit Airlines on Tuesday rejected Frontier Group's acquisition offer, worth about $2.16 billion, saying the bid from its fellow ultra-low-cost carrier was less beneficial to shareholders than ...