By early this morning, a few dozen had gathered outside the company's offices north of the airport, marching with picket signs.

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

Some 3,200 Boeing workers who build fighter jets in St. Louis, another Missouri site and one in Illinois are on strike, their union says.