Ground transportation from airport to FedEx ramp:
You need to meet the FedEx “A” bus at the “A” terminal; look for all the buses on the side of the building. It runs every 15 minutes or so.
The same goes when leaving the FedEx ramp for the terminal. Meet the “A” bus and take it to the “A” terminal. There is a tram that will get you to the “B” and “C” terminals.