Over 3,200 machinists at Boeing’s military aircraft facilities in the St. Louis area went on strike Monday after rejecting a contract offer. -The strike, the first by this specific union since 1996, impacts production of the F-15 and F/A-18 and raises questions about potential delays to the next-generation F-47 fighter

The strike involves roughly 3,200 workers at three Boeing sites, including its St. Louis hub, which is expected to be central to the F-47 program.

Boeing union workers who assemble fighter jets strike in two states following rejection of contract offering 20% general wage increase and $5,000 bonus.