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Boeing on Monday was hit with its second strike in less than a year, as 3,200 hourly machinists walked off their aerospace jobs in the St. Louis area.

Members of the International Association of Machinists (IAM) voted to authorize a strike at three defense plants starting Monday at 12:59 a.m. ET.

“3,200 highly-skilled IAM Union members at Boeing went on strike at midnight because enough is enough,” the union wrote on X after the walkout began.

The union overwhelmingly rejected a tentative agreement a week ago that would have given many of the members raises of 40% over the four-year life of the contract. The members voted Sunday to reject a revised contract that removed scheduling provision

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