Originally Posted by
MarkXS
US Clubs define Canada and Mexico as still "domestic" for purposes of denying access. But UA lounges do admit USA-based-program *G members on Canadian and Mexican itins as "international".
This is not entirely correct.
For US lounges, they do not deny *G on Mexico/Canada itins. They only deny their own (US members) on Mexico/Canada itins. *A prohibits them from denying other *G members on int'l itineraries.
I have successfully entered US lounges on a US ticket to/from Mexico and a UA*G card. Some agents question it, but if they refer to their documentation, it's quite clear. A US member is to be denied, but a UA (and presumably CO in the future) member is not.