WASHINGTON—Boeing has filed an unfair labor practice charge with the National Labor Relations Board (NLRB) against the union representing its striking West Coast factory workers. The aerospace giant accuses union leaders of failing to negotiate in good faith. This comes amid growing tensions as the strike, involving around 33,000 workers, enters its fifth week, intensifying the financial strain on Boeing.

The company withdrew its latest pay offer to the International Association of Machinists and Aerospace Workers (IAM) early this week after two days of talks with federal mediators, citing the union’s refusal to seriously engage with the proposal. Boeing also accused union leaders of misrepresenting the details of their offer to union members and not bringing negotiators with authority to finalize a deal.

Boeing claims the union’s public statements have been misleading, making it harder to reach a solution. On the other hand, the union criticized Boeing’s latest wage offer, calling it insufficient. Despite Boeing’s offer of a 30% wage increase over four years, the union did not present the proposal to its members and plans to conduct a new survey.

The dispute continues as production of Boeing’s key models, including the 737 MAX, 767, and 777, remains halted. Both sides are under increasing pressure to resolve the strike, with U.S. Transportation Secretary Pete Buttigieg emphasizing the need for a deal that benefits workers while ensuring the company's success.