I don't know if this applies across the board, but I've got a list of AmX Clubs available for Platinum cardholders:

Consul Club, Frankfurt
Grand Danube, Vienna
First Class Lounge,Abu Dhabi, & Dubai, UAE
Sala Centurion, Buenos Aires
Centurion Club, Mexico City
VIP Escort Lounge, San Juan
Salon Centurion, Sao Paulo