I just got asked for my card at the Miami International Hotel (the one in the airport). Couldn't believe it. It wasn't in my wallet because when I'm away from home, and not renting a car, I leave everything at home I don't need in my wallet. The guy at the desk refused me my discount. The next morning someone else gave it to me when I was checking out. I have been asked before, but I can't remember where. It's pretty hit and miss.