I monitor ZTL RCAG (remote communications air/ground) frequencies:
127.5500 MHz workload
134.0750 MHz Ultra High altitude
But go hear and scroll down to Tennessee and it will give you a lot to monitor:
Scanner Frequencies and Radio Frequency Reference for Atlanta (ZTL) Air Route Traffic Control Center
www.radioreference.com
FYI, when the frequency is labeled Low, High or Ultra High, that is letting you know the altitude that
it is intended for communication.
Example: A jet in Atlanta air control at 40,000 feet would be assigned to an Ultra High frequency as it is passing through
an air space that it will not land. It would not need to communicate with no one other than the air space controller.
As they approach their destination, they would be assigned to a lower altitude and a lower controlled frequency all the
way down to tower approach frequency of the airport.
One more thing to add, the rubber duck antenna provided with the scanner isn't an ideal antenna to use.
If being used at home, put up and outside antenna, doesn't need to be an expensive one, just a quarter wave
antenna around 20" will be just fine. You can use RG6 75 ohm coax, which isn't expensive, to run between your
radio and antenna. Since you will not transmit on it you don't need to worry about the SWR so don't need to
spend a bunch of money. This is what I use and it works great.