The proposal includes a wage increase of 35% over four years. The potential breakthrough ends a lengthy impasse marked by miscues and finger-pointing.

Boeing has made a new contract offer with a higher wage increase and other incentives in an attempt to end the strike. The union will vote Wednesday.

The deal reached by the machinists union, which represents more than 33,000 workers, would cumulatively raise wages by nearly 40 percent over four years, according to details shared by the union.