Thanks for the warning RichG, but I read it anyway.
Your memory is OK about no preferred seating on NW, Norm, preferred seating is available, however, on flights operated by America West! but not advance upgrades for OnePass elites.
Those of you who read the America West forum are aware that there is only one Flight Fund Platinum! (at least here in cyberspace) I guess that they don't want him to have to compete with all of us CO elites.