When I arrived at the Southwest Airlines Atlanta Airport Terminal, the check-in process at the North Domestic Terminal was straightforward. The self-service kiosks made printing my bag tags fast and easy, and Southwest staff were nearby to assist. Security lines were long, but they moved at a steady pace thanks to the efficiency of ATL's TSA team. Within 30 minutes, I was through security and on my way to Concourse C via the airport's Plane Train.