WDW2002 brings up an excellent point. On one of our vacations, my young daughter was very ill (vomiting, fever, etc.). We had to extend our stay, however, we were staying in the BWV resort. That resort was completely booked and we could not extend our stay there. However, the Front Desk was able to find a room over on the BWI side, and thus we switched to a room over there. We were charged rack rate for that room, so it was an expensive extension to our stay, but there was nothing that we could do, our little girl was too ill to fly back home.