After months of negotiations, approximately 525 UAW members have walked out on strike at Eaton Aerospace, an aerospace factory in Jackson, Michigan, that produces hydraulics equipment for civil, commercial and military aircraft. The strike came after the workers’ extended contract expired on September 5.

The union, which won a major contract victory last year, has criticized the company for cutting jobs and delaying plans at an Illinois factory.

The United Auto Workers union is eying multiple U.S. strikes against French-Italian carmaker Stellantis about a year after a national walkout cost the Detroit Three automakers billions of dollars and idled 50,