Boeing's (BA) key supplier and acquisition target, has raised substantial doubt about its ability to continue as a going concern amid mounting losses, rapid cash burn and production challenges.  Its debt balance as of September 26 was $4.

Aircraft-parts supplier Spirit AeroSystems Holdings Inc. on Tuesday said that there was “substantial doubt” about its ability to keep running as a “going concern,” as losses, debt, and difficulties at jet maker Boeing Co.

Wichita-based Spirit AeroSystems says it will soon end the furloughs of some of its employees and has no immediate plans to implement additional furloughs or layoffs after Boeing workers approved a contract offer on Monday.

WICHITA, Kan. (KSNW) — In a new filing with the government, Spirit AeroSystems says there is “substantial doubt about the Company’s ability to continue as a going concern.” It also says a plan to improve liquidity could include layoffs and more furloughs.

U.S. supplier Spirit AeroSystems said on Tuesday in a quarterly filing that substantial doubt exists about the company's ability to continue as a going concern.

Spirit AeroSystems, a key supplier to US planemaker Boeing, warned on Tuesday there was “substantial doubt” that the company would be able to continue as a going concern.

Wichita-based Spirit AeroSystems says it is not planning to implement additional furloughs or layoffs after Boeing workers approved a contract offer on Monday.