Striking machinists accepted a new contract raising wages by 39 percent, but enduring bitterness will complicate Boeing’s efforts to rebuild its battered corporate culture and flawed production process.

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.

Boeing U.S. West Coast factory workers were voting on an improved contract offer on Monday that could end a seven-week strike and restart most jet production at the troubled planemaker.Boeing's latest offer includes a 38% wage increase spread over four years,