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.

Boeing Co. and the union representing 33,000 striking workers reached a tentative agreement October 19 on a new contract with help from the White House, underscoring the high stakes to end a work stoppage that has crippled one of the largest U.S. exporters.