Come to Mexico. We need the tourists! It's the same number of miles to upgrade from WT+ to CW as the US and better bang for bucks since it's a much longer flight. BA fly to Mexico City several times a week and it's a 747 so you fly in style on the upper deck. Late September is a good time to visit as the summer rains will have made it green and lush in the central areas and there are a number of fiestas around that time.