I have thought long and hard about this and have decided to continue to put my miles on TWA. If the deal with AA goes through, I will assume that our levels will be matched. If not, then I'm stuck with AA miles that I may or may not use.
However, I would probably call AA and see if they would comp me to a Platinum (Elite1), if I wanted to fly them as my major carrier. The benefit of this is that they give 100% mileage bonuses as compared to the paltry 50% that TWA gives.
Speaking of which, has anyone tried this yet?
lala