Boeing’s 33,000 striking machinists disbanded their picket lines late Monday after leaders of the International Association of Machinists and Aerospace Workers district in Seattle said 59% of union members who cast ballots agreed to approve the company’s fourth formal offer, which included a 38% wage increase over four years.

The contract promises a 38% pay increase over four years and an increased 401(k) match. The striking workers rejected two previous contract offers.

Approval of the deal with 38 percent raises over four years is a key step toward recovery after Boeing suffered billions in losses from the work stoppages and safety problems.