My sisters are taking my son on a short trip next month and our brother heard about the trip and mentioned he might like to go. He has a non-expiring ticket with days on it and is able to fly stand-by for free so it is possible that he could just "show up". They have a studio so would have gotten a larger unit if they knew he was coming but they will not be over the occupancy if he "shows up" for a couple of nights. Dining reservations are already in place and increasing from 3 people to 4 might not be a big deal or he might opt just to do his own thing. They were considering getting the dining plan BUT if they buy the dining plan for the three of them and then my brother shows up 2 days later, will they be required to get the dining plan for 4 people and for all 4 days? Or can they just issue him another key without dining credits on it? And can he use Magical Express as a last minute thing or should he just be told to take a taxi?