For MCO: If you are on a domestic flight on a participating airline, with a flight after 11:30 am, you can have
DCL check you in. Your (checked)bags are picked up the last night outside your room (remember to leave clothes out to wear the next morning

) and you won't see them again until you get to your destination airport.
We've done this a couple of times. It's great.
Here's the information we got on our last time:
From Port Canaveral: (from cruise documents 8/9/2014)
The requirements are below
- You must have purchased DCL Air and/or DCL Ground Transfers
- Your flight has to leave from Orlando International Airport after 11:30 am on the same day your cruise vacation ends. *NOW NO FLIGHTS BEFORE 1:00 3/2016*
- Your flight must be on a participating airline:
AirTran Airways (no longer in business)
Alaska Airlines
American Airlines (USAirways merged)
Delta Air Lines
JetBlue Airways
United Airlines
· Your final destination must be within the U.S. (including Puerto Rico and the U.S. Virgin Islands)
· Each luggage piece can weigh no more than fifty (50) pounds.
· Airline specific baggage fees may apply and can vary by airline. Please check with your specific carrier for more details.
· Applicable airline baggage fees will be posted directly to your shipboard account.
· Some Guests may be selected to check in at the airport and may not be able to use this service.