Just to clarify...
At this time, the Resort Airline Check-In Service is only available for Guests flying domestically on the following airlines:
Alaska Airlines - NEW
American
Continental
Delta (including Song)
JetBlue
Northwest
United (including TED)
Resort Airline Check-in Service allows Disney Resort Guests to check their luggage and receive their airline boarding passes at their resort, if departing on domestic flights on participating air carriers from Orlando International Airport. This service is especially valuable especially if their scheduled flight departs later in the day. They can simply check their luggage at the Resort Airline Check-in Desk and then enjoy the last day of their stay.
Unfortunately, AirTrans has decided not to participate in this great free service.