Originally Posted by
~tc~
This is not true. As a *G, you only get domestic (USA) lounge access if connecting to an international itinerary.
If you want club access for domestic flights (USA), you need to buy a membership or get a credit card that includes it (like CO PP or AMEX Plat)
I think it is YOU who is mistaken here. Any *G member of a non-US carrier may use the lounge of any US *A carrier (UA|US|CO) regardless of whether the itinerary is a purely domestic one.