I just want to reply for future searchers because the other information online is unclear and the hotel staff is kind but doesn’t know anything about how the process works. If you are used to doing the Disney transfer from the hotel airport at MCO that may make you nervous, but do not be.
Rest assured that the process is organized and magical once the Disney concierges arrive, but if you are like me and in charge of a larger group with some mobility issues, here are the details!
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The fabulous Disney concierges arrived at the IAH Marriott at 6:30 am and although check-in does not start until 7:30 am, they got us all organized and were glad to help (we have some handicap issues and they were concerned how it would work as we do not have a wheelchair with us, we opted to take the first bus and told them if we can’t get everyone on the bus due to handicaps, we’ll simply call them an uber). Bags will be picked up in our rooms starting at 8:15 am, during check-in at Disney concierge you find out which bus you are on (first come to check-in first choice of bus which I got the feeling from the concierge was important) and the buses depart from the hotel lobby at 9:30 am. It does sound like it can get a little complicated as some of the buses are picking people up at the terminal at IAH (that was the case with the ADA coach today) so if you are on one of those buses you have to wait for that party to be located and boarded. We weren’t sure if it’s ok to use a lift without a wheelchair anyway so opted to just be flexible with uber option. They were willing to accommodate us absolutely, this was a personal choice.
Very thankful for this group & looking forward to a great trip!