NEW YORK -- Several thousand workers at three Midwest manufacturing plants where Boeing develops military aircraft and weapons went on strike early Monday, potentially complicating the aerospace company's progress in regaining its financial footing.

The strike started at Boeing facilities in St. Louis; St. Charles, Mo.; and Mascoutah, Ill., after about 3,200 local members of the International Association of Machinists and Aerospace Workers voted Sunday to reject a modified four-year labor agreement, the union said.

"IAM District 837 members build the aircraft and defense systems that keep our country safe," Sam Cicinelli, the general vice president of the union's Midwest division, said in a statement. "They deserve nothing less than a contract that keeps their families secure and recogni

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