Since op isn’t familiar with t gates, they are right past security and don’t require you to go down and take the airport tram, one I my favorite reasons to take aa out of atl gates are very quick to get to once you go thru security. Security can be a mess early morning is usually a nightmare when the weather was bad the night before, as long as there weren’t a ton of cancellations the night before it won’t be too bad at that hour.