(Reuters) -About 3,000 striking workers at RTX's Pratt & Whitney are slated to vote on a contract offer from the engine maker next week, the company and the union representing the workers announced on Friday, one day after negotiations resumed. The nearly three-week-long strike has significantly slowed production at two of the company's plants in Connecticut. Union representatives have said the workers' top priority is getting Pratt to commit to keep work for Lockheed Martin's F-35 fighters in the state.