Shares of Boeing Co. BA were off 3% in Thursday’s premarket action after the Spirit AeroSystems Holdings Inc. SPR said that its unionized workers have voted for a strike, which is causing Spirit to suspend factory operations. Boeing is Spirit’s largest customer, accounting for about 65% of its commercial segment net revenues last year, according to Spirit’s most recent 10-K filing. Spirit conducts design and manufacturing work for the aircraft market, and its shares were losing about 9% in premarket trading Thursday. “We continue to monitor the situation and support our valued supplier,” a Boeing spokesperson said in a statement provided to MarketWatch.
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