“For Boeing, it is no secret that our business is in a difficult period, in part due to our own mistakes in the past,” he said. “Working together, I know that we can get back on track, but a strike would put our shared recovery in jeopardy, further eroding trust with our customers and hurting our ability to determine our future together.”

The head of the union local, IAM District 751 President Jon Holden, said Ortberg faced a difficult position because machinists were bitter about stagnant wages and concessions they have made since 2008 on pensions and health care to prevent the company from moving jobs elsewhere.

“This is about respect, this is about the past, and this is about fighting for our future,” Holden said in announcing the strike.

The vote also was a rebuke to Holden and union negotiators, who recommended workers approve the contract offer. Holden, who had predicted workers would vote to strike, said the union would survey members to decide which issues they want to stress when negotiations resume.