After years of contentious feuding, Boeing and the machinists union announced Wednesday that they’d reached a tentative four-year contract extension on a collective bargaining agreement. If finalized, the deal would boost wages for union workers, issue bonuses, improve pension benefits, and likely preserve operations at a new $750 million plant in Charleston, South Carolina, a right-to-work state where Boeing jumpstarted a new production line for its 787 airplane. Acting on a complaint by the machinists union, the National Labor Relations Board (NLRB) cast a politically charged lawsuit at Boeing in April, contending that the aerospace company usurped labor laws by launching the production line in South Carolina, rather than Washington state. The agency alleged that Boeing had introduced the line to punish union workers for past strikes, which the NLRB deemed illegal retaliation against workers exercising their right to strike and bargain collectively. Also part of the Boeing-union deal is a guarantee to manufacture a new, more fuel-efficient airplane, the 737 Max, at facilities in Renton, Washington, which is located near Seattle. Union leaders said they are pleased with the deal and have issued assurances that if it reaches final approval, the union will ask the NLRB to drop the case. "If this agreement is ratified, we will engage the government in discussion and inform them that our issues with the Boeing Company are behind us," assured Tom Wroblewski, president of District Lodge 751, which represents 28,000 workers in the Puget Sound area.