I often do such stopovers, and 9 out of 10 times even 30 minutes is enough.

Also, the international connection will typically wait (they often start late just for that reason, and they have an hour or so buffer built in for it).

However, if your first flight is seriously late, you will miss the second one; but it is the airlines problem, and they will rebook you on the next day, and give you hotel and meal coupons and pay for taxi to hotel, etc. So if you are not in serious trouble because you arrive a day later, you should enjoy a free vacation day in Atlanta.

I often do such stopovers, and 9 out of 10 times even 30 minutes is enough.

Also, the international connection will typically wait (they often start late just for that reason, and they have an hour or so buffer built in for it).

However, if your first flight is seriously late, you might miss the second one; but if it is not due to weather and other 'uncontrollable outside influences', it is the airlines problem, and they will rebook you on the next day, and give you hotel and meal coupons and pay for taxi to hotel, etc. So if you are not in serious trouble because you arrive a day later, you should enjoy a free vacation day in Atlanta. If they can blame it on weather, you are on your own. They probably would still rebook you for free to the next day, but you pay the stayover.