Thousands of Boeing aircraft machinists have rejected a contract offer for the second time in less than two months, meaning a strike that has halted airplane production at the company’s factories around the Puget Sound region for nearly six weeks will go on.

Boeing factory workers voted against the company’s latest contract offer and will remain on the picket lines six weeks into a strike.

Boeing Co. factory workers rejected a new labor contract that would have increased their wages by 35% over four years, exacerbating the aircraft manufacturer’s crisis as it struggles to overcome a crippling work stoppage.