NEW YORK (AP) — Boeing workers who build fighter jets are planning to go on strike Monday at midnight.

(Reuters) -Union members who assemble Boeing's fighter jets in the St. Louis area rejected the U.S. planemaker's latest contract offer on Sunday and will strike at midnight on Monday, the International Association of Machinists and Aerospace Workers union (IAM) said.

Boeing Co. is bracing for the first strike in nearly three decades at its St. Louis-area defense factories after union members rejected the company’s modified contract offer.