Spirit AeroSystems is weighing furloughs or layoffs of hundreds more employees if the Boeing machinists' strike stretches beyond Nov. 25, a company spokesman told CNBC on Thursday. More than 32,000 Boeing machinists walked off the job on Sept.

Spirit AeroSystems posted deeper quarterly losses on Wednesday and said it was burning through dwindling cash reserves, as a strike by Boeing U.S. factory workers hammered the finances of its biggest supplier.

Spirit AeroSystems Holdings Inc. will start furloughing workers later this month in response to the continuing strike at Boeing Co., the aerostructure supplier’s biggest customer.

As the Boeing Company (NYSE:BA) strike drags on, Spirit Aerosystems Holdings, Inc. (NYSE:SPR) faces tough choices ahead, including the looming threat of layoffs and extended furloughs. On Friday, Spirit Aerosystems announced employee furloughs in response to the ongoing strike by Boeing workers represented by the International Association of Machinists and Aerospace Workers,

U.S. supplier Spirit AeroSystems on Wednesday reported third-quarter revenue below analysts' estimates and a loss of $4.07 per share, as a strike by Boeing factory workers weighed on its results. The company said that it would not provide forecast for the current year.

Spirit AeroSystems, stock fell 1.1% to $32.29 in the premarket Thursday. GE Aerospace and RTX Corp. are also important suppliers for Boeing. RTX stock has gained 5.7% in the last

Shares in Spirit AeroSystems (NYSE:SPR) fell around 1% in premarket trading Thursday after the aerostructure supplier reported a deeper-than-expected quarterly loss. The company posted a Q3 loss of $3.

"Just to be clear, there's no change in our commitment to the Spirit acquisition and the integration," Boeing CEO Kelly Ortberg said.