I agree with the prior posts. I would also encourage you to use taxis for transportation to/from the airport. Taxi is less expensive than shuttle for famalies of 3 or more, and in many cases less than limo/towncar. Taxi can meet and greet just like towncar and offer great service for less money.
Now back on the subject, Checker cab is contracted to provide cab service throughout Disney, and these drivers will provide excellent service to you during your stay.
taxi_man696