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 said.

“IAM District 837 members … deserve a contract that reflects their skill, dedication, and the critical role they play in our nation’s defense,” the union’s Business Representative Tom Boelling said.

Boeing said it was ready for the action. “We are prepared for a strike and have fully implemented our contingency plan,” Boeing Air Dominance vice president and general manager Dan Gillian said in an emailed statement to Reuters.

Boeing’s original offer proposal included a 20% general wage increase over four years and a $5,000 ratification bonus

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