Boeing Co. expects more than 3,200 union workers at three St. Louis-area plants that produce U.S. fighter jets to strike after they rejected a proposed contract Sunday that included a 20% wage increase over four years.

Several thousand Boeing union workers at three St. Louis-area plants who build fighter jets are planning to go on strike after rejecting a proposed contract.

Members of the union representing workers who assemble Boeing fighter jets have rejected a new contract proposed by the US aircraft manufacturer, paving the way for possible strikes