I would venture to bet OP is going to the Delta ATP-CTP.
Off the top of my head there are a couple that can help you out...
Accessible Aviation, formerly of Columbus, MS has now moved to the ATL area, give Carl Nuzzo is the name of the owner.
Next closest is Jasper Aviation in Jasper, AL
Then the 3rd closest would be Mil2ATP out at Goldsboro, NC