SEATTLE (AP) — Aircraft assembly workers went on strike Friday at Boeing factories in Washington, Oregon and California after union members overwhelmingly rejected a tentative contract that would have increased wages by 25% over four years.

The work stoppage involving 33,000 machinists will not disrupt commercial flights immediately but was expected to shut down production of Boeing's best-selling airliners, presenting another setback for a company already dealing with a damaged and .

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