Spirit Airlines is filing for bankruptcy after failed merger talks with Frontier, facing financial losses and upcoming debt obligations.

Spirit Airlines Inc. on Wednesday said it would furlough around 330 pilots early next year, the latest money-saving effort by the struggling discount carrier to stay afloat as it wrangles with debt, losses and weaker sales.

Spirit Airlines is preparing to file for bankruptcy protection after merger talks with Frontier Airlines broke down, the Wall Street Journal reported, citing people familiar with the matter. The ultra-low cost carrier is in advanced discussions with bondholders to hammer out a bankruptcy plan that would have support from a majority of creditors,