Boeing spokesman Doug Alder said the company is legally obligated to have discussions with SPEEA, but he noted Conner's statement about the importance of the 401k transition for future hires.

NPR: New Boeing Contract Splits Engineers, Tech Workers

"With this second rejection by technical workers of Boeing takeaways, it's time for the company to stop wasting resources and improve its offer to reflect the value and contributions technical workers bring to Boeing, " SPEEA Executive Director Ray Goforth said in a statement.

NPR: Boeing Engineers OK Contract; Tech Workers Say No