Originally Posted by
justpetehere
Amazing! Non-domestic bookings must be slipping through now. Wish I would have tried now before using mine

The Prestige card companion ticket was always valid for international travel anywhere. The Premier card was the one that was restricted to domestic.
Also useful is that you can book open jaws, a tactic I used to get better times / routing for my flights because there were less fares for my itinerary.