Here is the link to the Frequently Asked Question page for Disney's Magical Express service:
click here. It currently states the following (but is subject to change at any time so place a call to see if SW has been added to the list):
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RESORT AIRLINE CHECK-IN and Out-Bound Luggage Handling
Q: What is Resort Airline Check-in?
A: This service offers remote check-in, allowing you to check your luggage and receive your airline boarding pass at the Resort. At this time, remote check-in service is only available for guests flying domestically on the following airlines: American, Continental, jetBlue, Delta (including Song), and United (including Ted). Additional airlines may be added at a later date.
Q: What do I do with my luggage if I'm not using the Resort Airline Check-In service?
A: Please take your luggage with you on the bus or other transportation you have arranged to return to the airport.
Q: Where are the Resort Airline Check-in Desks located?
A: The dedicated check-in desk will be located in or near the lobby or outside the Resort entrance.
Q: What are the hours of operation for the Resort Airline Check-in Desk?
A: 6:00 a.m. to 2:00 p.m.
Q: How early can I check-in for my flight using the Resort Airline Check-in Service?
A:You may check in up to 12 hours prior to your scheduled flight departure time.
Q: How far in advance of the scheduled flight time do I need to check-in using the Resort Airline Check-in Service?
A: You must check in no less than 3 hours prior to your scheduled flight departure time.
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I just used Disney's Magical Express two weeks ago. I departed from the Animal Kingdom Lodge and flew on American Airlines. The Magical Express Cast Members inside the AKL took my luggage and printed my boarding passes for me. It was a wonderful service. I will definitely use Disney's Magical Express again.