Machinists in the state of Washington hope that a new contract offer to Boeing will lead the company to decide to build the new 777X plane in the Seattle area.
The union made the proposal on Wednesday night after two days of talks between the Machinists and Boeing executives.
(Read more: Air Canada buying $6.5 billion in Boeing planes)
In announcing the latest move on the web site for the International Association of Machinists, Local 751 President Tom Wrobleski said, "We tried to craft a proposal that would meet the needs of our members, while also ensuring the long-term success of the Boeing Company in Washington State.
Neither the Union nor Boeing have released any details of the offer.