Just wanted to clarify my earlier post...there seems to be some confusion, three things are being discussed here. RAC , DME, and ECBI are three separate things. RAC=check your bags at the resort with airport workers, they will not check you in unless you go there and ask them to, they will print boarding passes for you, it's the same as if you check in at the airport. You do not have to use DME to use RAC. DME=Will check in for your flight and print boarding passes, not necessarily right at the 24 hour mark, you can check your luggage at RAC or take them on the bus with you. ECBI is a paid service through SWA and you will be checked in before 24 hours automatically, no need to do it again. You can print boarding passes anytime after the 24 hour mark at the resort, RAC, or the airport if not using DME. SWA does not care how you or your luggage gets to the airport, you do not have to use RAC or DME. If using DME, I would either buy EBCI or check in on the app exactly 24 hours before, it could make a big difference on your boarding number.