NEW YORK — Boeing workers at several facilities are preparing to strike after rejecting a proposed labor agreement with the company. The walkout is set to begin at midnight Central Daylight Time on Monday.

Approximately 3,200 members of the International Association of Machinists and Aerospace Workers from Boeing locations in St. Louis, St. Charles, Missouri, and Mascoutah, Illinois, voted against a modified four-year contract. This decision comes shortly after the union turned down a previous offer that included a significant wage increase.

“The members of IAM District 837 play a critical role in building the aircraft that safeguard our nation,” said Sam Cicinelli, the union’s Midwest vice president. He emphasized the need for a contract that ensures job security for these workers and acknowledges their specialized skills.

While union leaders had earlier endorsed an offer they described as a “landmark agreement,” the members ultimately found it lacking. That proposal included a 20% wage increase and improvements to medical, pension, and overtime benefits. Following a brief cooling-off period, workers decided to reject Boeing’s latest offer.

Dan Gillian, Boeing’s vice president and general manager for Air Dominance, expressed disappointment over the rejection. He noted that the offer included an average wage growth of 40% and addressed worker concerns regarding alternative work schedules. “We are ready for a strike and have implemented contingency plans to ensure that our non-striking workforce continues to support our commitments to customers,” Gillian said.

Boeing is navigating a challenging landscape after enduring setbacks related to its 737 Max aircraft, which were involved in two tragic crashes resulting in the loss of 346 lives. The company’s struggles have been compounded by other issues, including a recent crash of a Dreamliner operated by Air India, which resulted in another significant loss of life.

Despite these challenges, Boeing reported improved financial results for the second quarter, where losses narrowed to $611 million, a notable drop from the $1.44 billion loss reported during the same timeframe last year. As the company continues to face labor disputes and public scrutiny, the impending strike reflects ongoing tensions as workers advocate for better terms in their employment contracts.