Thanks Alan. That's a bummer about being locked into the companion card. It does sound like marriage. Funny.

I have a few trips in mind (for over the next year) with different friends where it would have been nice to get that third person into the Diamond lounge. I'll just have to choose a friend to lock in now. Can the companion go the Diamond lounge anytime, even when I'm not in Vegas? Can the companion bring their own guest to the Diamond lounge (probably not)?