Very interesting show, with lots of advice. Thanx, all! If you ever find out how RCL does it, I'd love to know. And I can't wait for the concierge podcast!!
I've never gotten an upgrade at port, however, I did get one from Disney a few days before a transatlantic cruise from a porthole stateroom on the second floor to one with a balcony on the sixth floor of the Disney magic.