Spirit Airlines is reportedly planning to file for bankruptcy following the collapse of a proposed merger with Frontier Airlines that sent its stock into rapid decline.

Spirit Airlines is preparing to file for bankruptcy protection after merger talks with Frontier Airlines broke down, according to people familiar with the matter. The Florida-based budget airline is in advanced discussions with bondholders to hammer out a bankruptcy plan that would have support from a majority of creditors,

Spirit Airlines shares plunged Wednesday on a report that the budget carrier is getting ready to file for bankruptcy protection after revived merger talks with Frontier Airlines parent Frontier Group Holdings collapsed.