All Disney resort guests travelling on all airlines domestically always have been able to use all DME inbound services, including luggage transfer, and DME motor coach service to return to the airport.
Until the past year or so, guests flying on SWA had not been able to use Resort Airline Check-in, a separate service that allows you to check bags and get boarding passes for your homebound flight. As of earlier this year, however, RAC has been available to SWA passengers at most Disney resorts. OKW and CBR guests were not able to use RAC if flying SWA, but I believe SWA is now up and running with RAC at OKW. That leaves only CBR as a question mark.