I just transferred at ATL
on 2/7 and 2/10 with a 1 hour 5 minute layover. The first leg of the flight arrived early, but we waited 20 minutes for a gate, so any time advantage disappeared. However, as pointed out, ATL
is one of the best US airports for transfer. You won't even break a sweat to get from one terminal to another, very efficient. I'm wondering about Immigration & Customs -- would you have to go through this control at ATL
or your final destination, MIA
? I don't know the answer, but I thought these steps are taken at the final destination, not at the transfer point.