Concourse matters for Concourse matters for Atlanta Airport security wait times​. The newly expanded T Gates process passengers 25% faster than older checkpoints. Meanwhile, Concourse D's temporary construction has created occasional 10-minute delays, though TSA promises this will improve when renovations finish next quarter.. The newly expanded T Gates process passengers 25% faster than older checkpoints. Meanwhile, Concourse D's temporary construction has created occasional 10-minute delays, though TSA promises this will improve when renovations finish next quarter.