40 minutes is fine. If arrival in ATL is delayed you may have a problem if the outbound isn't delayed, but often it is. For a domestic transfer 40 minutes should be fine.
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The short answer (based on my own personal experience) is that the minimum connection time for domestic flights in Atlanta is 35 minutes. It doesn't matter what terminal you arrive at and what terminal you're departing from. 35 minutes is doable. Anything less than that, not so much.
What is the minimum layover for domestic flights in Atlanta? The short answer (based on my own personal experience) is that the minimum connection time for domestic flights in Atlanta is 35 minutes. It doesn't matter what terminal you arrive at and what terminal you're departing from. 35 minutes is doable.
The bus ride between the terminals takes about 15 minutes. In addition, the International Terminal Connector provides service between the International Terminal and the Car Rental Center and runs approximately every 15 minutes.
Yes, Delta Airlines aims to accommodate connecting passengers whenever possible. They understand travel schedules can be tight. However, planes might wait briefly if the connecting flight has a reasonable number of passengers on the way.
Generally speaking, most airlines will make some kind of efforts to wait for delayed passengers on a connecting flight, though this is not necessarily guaranteed. In some cases, airlines may be able to hold a connecting flight for a period of time, but it is not something that is typically guaranteed by any airline.
If your itinerary was purchased as one ticket (as in: you have only one itinerary and one confirmation number), and the connection time was too short and you miss the second (or third) flight, you can rest easy, no matter what happens. The airline will simply put you onto the next available flight, free of charge.