There is no new terminal near the new runway. After Delta went bankrupt the city said no. There is an expansion of the international terminal but I don't when that will be finished. Only suppose add a few gates I think 8. The new terminal at the earliest would be built decade from now. But there is no reason why SWA can't build the terminal themselves and fly out of ATL. I can guarantee you the city would LUV them in ATL.