We have flown SW with DH's power chair & used ME.
Things worked for us, just as the previous poster has stated. ME handled the baggage from the Orlando airport to the resort.
Overall we felt it all worked very well. We did have to wait a bit longer the ME ramp bus, but it wasn't excessive.
SW has also always treated DH quite well & is very accomadating for loading & unloading .
Good luck & have fun!