As far as Boeing goes, there is a lawsuit/inquiry going on with the NLRB (or one of the Boards) about moving a 787 line to South Carolina. I heard that if the move was done to punish the union for not being willing to sign a "no strike" contract this last time, it is illegal. Looks like Boeing is facing an up hill battle.

Here is one of the later articles on the topic:

Business & Technology | Boeing's South Carolina move gets even more political | Seattle Times Newspaper

Denny