Our flight arrives at 10PM the night prior to our resort reservation. Can we stay at the airport hotel and book the Magical Express for early the next morning on our check-in day?
Yes Just call and tell them what you need. If your reservation starts the next morning that is fine. As long as you have a resort reservation you don't even need a flight
FYI There is a Transportation sub Forum here on the DIS for these type of questions. This is the Resort Forum.
Just remember do not pt the yellow tags on your luggage.
You will have to go to baggage claim when you arrive at mco and then bring your luggage to dme yourself in the morning (though you could probably get bell services at the hotel to help you)