A close vote by machinists union members approved contract concessions that mean Boeing will build the new 777X Dreamliner in the Seattle area. Missouri and about a dozen other states had hoped to attract the huge project.

The Missouri Legislature met in special session last fall to approve an incentive package specifically designed to encourage Boeing to build the Dreamliner assembly plant in Saint Louis County.

But after Friday’s vote, Boeing CEO Ray Conner said the union concessions mean the Dreamliner and its composite wing will be built in Washington. Missouri officials are still hopeful the state can play some role in the giant project.