Boeing’s Biggest Supplier Suspends Output After Strike Vote

  • Spirit AeroSystems workers reject four-year labor contract
  • Former Boeing unit makes fuselages for 737 Max jetliner
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Boeing Co.’s biggest supplier suspended production after union workers voted to strike, a surprise development that risks disrupting the planemaker’s plan to lift output of its cash-cow 737 Max jet.

Spirit AeroSystems Holdings Inc. slid as much as 15% in New York trading, its biggest intraday drop in two months, after union members rejected a four-year contract proposal supported by their leadership. Boeing, which relies on its former unit to make 737 fuselages and other aircraft assemblies, fell as much as 4%.