More than 3,000 Boeing defense workers went on strike Monday morning after rejecting the company’s latest contract proposal. The workers, mostly based in the St. Louis area, are responsible for assembling and maintaining F-15 fighter jets and missile systems.

Boeing’s defense unit generated about 30% of the company’s $42 billion in revenue during the first half of this year.

The company said it doesn’t expect significant disruptions due to the strike.

“We are prepared for a strike and have fully implemented our contingency plan to ensure our non-striking workforce can continue supporting our customers,” Dan Gillian, a Boeing vice president and senior executive at the St. Louis site, said in a statement shared with CNBC. He added that the company is “disappointed that the offer was rejec

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