Sounds great! Thanks for the help

How do you know if your airline participates? Just curious since I'm brand new to this.
Here is the info direct from allears.net:
"
Resort Airline Check-In Service
* Resort Airline Check-In Service at your Disney resort is only available if you are flying domestically (includes Puerto Rico) on the following airlines: AirTran, Alaska Airlines, American, Continental, Delta, JetBlue, Northwest, United (including TED) AND USAirways (as of 9/07). It is a complimentary (free) service.
* This service allows you to check your luggage and receive your airline boarding passes right at your resort on the day of your departure.
Changes to Resort Airline Check-in Baggage Policy
Effective June 1, the Resort Airline Check-In service implemented several changes in its checked baggage policy:
-- Guests who fly AirTran, Continental, Delta, JetBlue, Northwest, and US Airways may check one bag per passenger using the Resort Airline Check-in Service. Guests with multiple bags on these airlines will have the option to check additional pieces through their airlines' ticket counters at Orlando International Airport or they may call Baggage Airline Guest Services at 407-284-1231 to pay their airline's excess luggage fees in advance of checking in at the Resort Airline Check-In desk. The excess luggage fees vary by airline.
-- Guests flying on American who wish to check bags must call Baggage Airline Guest Services at 407-284-1231 to pay their airline bag fees in advance of checking in at the Resort Airline Check-In desk. Otherwise, Guests must check-in at the airport.
-- Guests flying on United Airlines are subject to checked bag fees based on when they purchased their tickets and when they are flying. Verify the actual fees with United before traveling.
-- Guests flying on Alaska Airlines are not subject to bag fees at this time. NOTE: Alaska Airlines will be subject to excess bag fees effective July 1.
NOTE: Each airline has a long list of exceptions to these checked bag policies. Exceptions may include those who bought before the new rues, elite frequent fliers (and those traveling with them on the same reservation), first class passengers, full-fare economy passengers, and government and military fare passengers. Consult with your airline on its exact policies before traveling. The Resort Airline Check-in Desk may be also be able to provide you with airline-specific fee information.
Baggage Airline Guest Services (the fee collection service, not the Resort Airline Check-in Desks) operates seven days a week between the hours of 7 a.m. and 11 p.m. If paying for excess luggage fees through Baggage Airline Guest Services you must pay with a credit card: MasterCard, Visa, and American Express are accepted. Resort Airline Check-In desks are unable to collect luggage fees on behalf of the airlines.
For ALL airlines, luggage must be 50 pounds or less in order to use the service and it must comply with their airline's size dimension baggage policy. Overweight and oversized luggage cannot be accepted at the Resort Airline Check-In desks."
Hope this helps. It sounds complicated as I read it, but it's really much easier than it sounds.