When driving to the Atlanta Airport. Be sure to go to the new International Terminal. It opens May 16th. You can view directions and more information here - http://www.atlanta-airport.com/InternationalTerminal/passenger/directions.html
Q: I accidentally went to the domestic terminal to check in for my international flight. What should I do?
A: A free shuttle service will be available to the international terminal. Shuttles are available at the ground transportation center at the west end of the domestic terminal.