No, AirTran never had the the north part of concourse C. Well, at least going back to the Valuejet/AirTran merger in 1999. before that I'm not sure. Valuejet may have operated out of the north side of C back in the mid 90s. AirTran did have a majority of the gates on the south side of concourse D up until a few years ago. Once AT disappeared completely SWA gave those back to the city, and now SWA only operates out of the south side of C.