Some Machinists union members plan to push for a recount or even a new vote on the Boeing labor contract narrowly approved Friday that guaranteed 777X production in Washington state but took away workers' pension plans, Reuters reported.

The vote was 51-49 percent in favor of the new eight-year labor deal that starts in 2016.

Union leaders said there have been many close votes in the past and they have not been recounted or held a new vote. It was unclear how any procedure to reconsider the vote would work.

Had the workers rejected the offer, Boeing would have considered making the successor to its popular 777 wide-body jet elsewhere, and had received offers from 22 states, including South Carolina, interested in hosting the new factory.

"Just because there is a close margin is not a reason for recount or re-vote," said Frank Larkin, spokesman for the International. "It is not automatic."