Spirit AeroSystems said there is "substantial doubt about the company's ability to continue as a going concern" though Boeing and Airbus are planning to acquire portions of the parts maker.

Spirit AeroSystems, a key Boeing supplier, is temporarily laying off workers on its 737 production line to manage an inventory surplus, the company said Friday.

Between 250-350 employees at Spirit AeroSystems in Wichita were notified Friday morning that their job will soon be furloughed for about a month because of a backlog, spokesperson Joe Buccino said. The furlough will begin May 12 and go through mid-June. It is supposed to be about 30 days before the employees return to work, he said.