NEW YORK (AP) — Saying “enough is enough,” thousands of workers at three Boeing manufacturing plants went on strike overnight less than a year after the company boosted wages to end a separate, 53-day strike by 33,000 aircraft workers.

Boeing's fighter-jet factory workers go on strike after turning down a new contract offer. The roughly 3,200 workers began their strike early Monday. Boeing had offered 20% wages increases, a $5,000 bonus and other improvements.

Employees at Boeing’s St. Louis defense factories rejected a contract offered by the aerospace giant Sunday afternoon and around 3,200 workers began striking starting at midnight—the first walk out the company has faced at its St. Louis defense hub since 1996.