Hi! If you are flying on Southwest Airlines via Hartsfield-Jackson Atlanta International Airport (ATL), then Southwest Airlines ATL Terminal you would use Concourse C in the Domestic Terminal. The experience of the Southwest Airlines ATL Terminal is easy to check in, and friendly staffs would make it much more comfortable, with a sufficient choice of dining outside. Security lines get a little busy, though things generally move very quickly. The terminal was clean and organized, making catching a flight stress-free. Whether you're flying out for business or pleasure, Southwest at ATL gets you there safely and comfortably. Safe travels! visit us : https://www.terminalsme.com/southwest-airlines/southwest-airlines-atl-terminal-hartsfield-jackson-atlanta-international-airport/