Boeing Co. and union leaders representing striking workers at its St. Louis-area defense factories will return to the bargaining table Monday, as they aim to end a three-week long impasse.

Top machinists union officials and a Democratic congressman joined striking workers outside a Boeing Defense facility near St. Louis on Thursday, pressing the company for a contract closer to an agreement reached with its Seattle-area workers.

After a two-week pause in negotiations, Boeing and the machinists union are set to meet again as a St. Louis-area strike continues.