Follow what I'm announcing...if you can

After you return your Hertz rental car, you take the Hertz shuttle bus back to the airport terminal. Pretty standard.

There are two terminals at Atlanta airport - South and North.

So the announcement on the shuttle goes something like this: We will be arriving at the South Terminal. This bus makes one stop. The South Terminal is for Delta, AirTran, etc, etc. If you have a ticket or boarding pass for these airlines, get off here. Also if you have a boarding pass for any other airline except American or are going to Terminal T or want to walk
but are not handicapped or like to eat dinner before your flight but don't want to get too stuff....you can also get off here....or wait until the North Terminal.

And it just went on and on.

I got off.