Originally Posted by BoeingMyWay

Take the AirTrain over to Federal Circle. Go down to the street level and take the bus that goes to the airport Post Office via the North Cargo Boundary Rd.....just ask the driver. Busses run about every 20 min and they're also free like the AirTrain. Stops right in front of the FedEx facility. Walk from the stop into the parking lot and head towards the security screening trailer. Very easy!