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.

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,

The embattled discount airline is in rough financial shape, with shares falling 64% in premarket trading on Wednesday. Here’s the latest. Shares in Spirit Airlines (NYSE: SAVE) are trading down over 64% in premarket as of this writing.