Aircraft assembly workers walked off the job early Friday at Boeing factories near Seattle and elsewhere after union members voted overwhelmingly to go on strike and reject a tentative contract that would have increased wages by 25% over four years.

The strike started at 12:01 a.m. PDT, less than three hours after the local branch of the International Association of Machinists and Aerospace Workers announced 94.6% of voting workers rejected the proposed contract and 96% approved the work stoppage, easily surpassing a two-thirds requirement.