(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.

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

Boeing ( NYSE: BA) is facing the prospect of its first strike in nearly 30 years at its defense manufacturing facilities near St. Louis, after union members rejected a revised labor agreement.