I think it is safe to assume that when a poster writes "Amex Travel" they have been dealing with Expedia, not with PTS. American Express has made it increasingly difficult to contact PTS. The phone number is not listed in any of the obvious places.
I'm really not sure. I call a phone number for "American Express Travel Services" which is 800-297-2977. However I press a menu option designating me as a platinum card holder.