When you make your DME arrangements through MS, just have a flight number/time of a flight that gets into MCO at about the time you will want to leave on Sat morning. If you want to leave the airport at say, 8:00 am, find an arriving flight that gets in at about 7:30 or so. Give them, MS, the flight info from that flight..you'll be all set. You won't be able to use those nifty yellow tags but that's no biggie. Just take your luggage with you, to the bus, and it will go underneath the bus.