So why doesn’t Boeing agree to build it in Mobile?
Win-win!
It would be but the non union Boeing plant is in SC and will be for a second 787 assembly line.
They do have a non-union plant is South Carolina. Wouldn’t it piss off all their WA and Union supporters if they decided to assemble it there?
Because the production facility in Everett is currently building 767's (in the largest building in the world by volume), the workforce and supply chain are in place, of course, and the process has been highly refined in the 30 years since the prototype airframe began construction.
Sure, it's possible, but it certainly would not be profitable.