40 minutes is almost never enough time for a layover in Atlanta. Even if you arrive right on time, and your next flight is one gate over from your incoming flight, the Atlanta airport's ability to transfer baggage from one plane to another very often exceeds 40 minutes.
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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.
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.
Delta Air Lines occupies the South Terminal with its own curbside check-in and baggage claim area. Other domestic airlines, such as Southwest Airlines, United Airlines, Spirit Airlines, Alaska Airlines, and JetBlue Airways, operate out of the North Terminal with a baggage claim area and check-in facilities.
Here it is known as transit time or connecting time. If the airline you are traveling has issued a ticket with 40 minutes connecting time, yes indeed that's sufficient. Different airports have different minimum connecting times or M C T.
It varies. They will often wait a little while, especially if it's the last flight of the day and even moreso if there are multiple passengers making the same connection. I've had Delta wait for me after inbound connection delays on several occasions.
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.
Delta: 30-minute minimum connection time. Southwest: At least 30 minutes if you have checked bags. United: 30-minute minimum for domestic, 60 minutes for international.
This average wait time is based on the current time (Pacific Standard Time). Please expect to wait up to at least (13 mins) on average to go through security checkpoints at ATL.
Each concourse is about half a mile in length with the entry point in the middle, so you would need to allow around 5 minutes to walk to the furthest gate from the halfway entry point.
Less than 60 minutes is always risky. Everything in your flight should go flawless for it to be enough but that's rarely the case. It depends a lot on the airline you're flying and also the airports you're flying to/from. If it's an international flight then give yourself at least 2 hours (and that's already tight).
Why is Atlanta the busiest airport in the world? One reason is its role as a top gateway to Florida. In fact, Atlanta's single busiest market ranked by seat capacity is Orlando, which also happens to be one of the busiest routes in the US.
If your flights were booked under one ticket, your bags will be checked through to your final destination. If your flights were booked under separate tickets, you will need to collect your bags and recheck them before your connecting flight.
Atlanta Airport's Concourse A serves Delta Air Lines only. Gates A1-A34. Atlanta Airport's Concourse B also serves Delta Air Lines plus Hooters Air. Gates B1-B35.