Usually the shortest connection in ATL is 35min it is doable as long as your first flight isn't delayed. All flights depart/arrive in the C concourse in ATL so you won't ned to worry about taking the plane train to go to a different concourse.
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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.
A one hour layover is never enough at any airport. The slightest delay on your first flight endangers your right to board your second flight. I would accept a one and a half hour layover but prefer two hours for peace of mind.
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.
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.
Of course answers might change depending on which airline/terminals your flights are using, but this is definitely very tight. 50 minutes is doable if your initial flight is on time. I wouldn't worry too much if there are more flights that day to your final destination or if the planes leave from the same terminal.
The recommended layover time for international flights is generally longer, as you will have to go through customs and immigration before boarding your next flight. In most cases, a 30-minute layover for domestic flights and an hour for international flights is considered a minimum, or short, layover.
What is a good connection time? Travel advisers say there's a lot to take into account when booking connecting flights, but a general rule of thumb is 60-90 minutes between domestic flights and at least two to three hours for international itineraries.