As a Platinum flying internationally (actually "intercontinentally" as someone pointed out on another thread) you can bring in one guest who is flying with you(or more guests if they are all immediate family members flying with you -- I've brought in both my wife and daughter before with no trouble.) Of course since you're both flying in Business Class internationally you can both go in anyway -- Platinum or not. In other words, your wife won't even be coming in as your guest -- she qualifies on her own. (In fact each of you could bring in another guest on your own ...) One other thing in case you might be wondering: no, you can't go into the Flagship Lounge even though you're "double-qualified" to enter the Admiral's Club as a Platinum and a Business-class flyer. (Maybe if you were an AC member and thus "triple-qualified"? Naaaah -- just kidding!)

Enjoy your trip!