Anne McNamara (former General Counsel for AMR) was on the board of directors for the American Arbitration Association (AAA).
Perhaps FWAAA or TWAnr want to comment on the professional ramifications, but the claims of the AAA allowing rigging or other intentional improprieties to take place is nothing but a red herring. I don't know of any lawyer who will risk their license (or their reputation) just to promote their former company's agenda.
It's also stated on their website "No special treatment of any kind is given to neutrals or directors when or if they do file cases or use election services. AAA employees are held to the AAA Standards of Ethics and Business Conduct requiring impartiality in providing AAA administrative services. "
You can read the full text at
http://www.adr.org/sp.asp?id=22036
Now, whether or not there was rigging on the part of the unions or the company is another story, as are the questions over just how random PIN generation was, but I don't think AAA did anything intentionally stupid or illegal.