DFW has a new internal tram system that is close and quick. Appreciating that 40 minutes is tight, if you are on time the transit is no problem. While nobody likes to miss a connection, I'd keep the tight schedule and make them book me on the next flight rather than voluntarily sit around for several hours.
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You can get your steps in and be to the next terminal in 20 minutes! For Terminal Gate A13: the walk to Terminal Gate B4 is approximately 20 minutes. the walk to Terminal Gate C2 is approximately 19 minutes.
If you're connecting from a domestic flight, then you won't need to clear customs and immigration, and you can remain airside to connect to your next terminal, unless you're flying from Terminal E where no airside connections are available.
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.
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.
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.
This average wait time is based on the current time (Pacific Standard Time). Please expect to wait up to at least (4 mins) on average to go through security checkpoints at DFW.
If the missed connection is the airline's fault (a delayed initial flight due to mechanical problems, for example), the airline should rebook you on the next available flight. If the next outbound flight is the following morning, the airline should either book you on another airline or provide accommodations and meals.
If a delay in your first flight is the reason you're missing your connection, don't worry too much. Usually, most airlines will rebook you on the next flight, and that too for free. Although, you might have to fly on standby depending on seat availability.
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.
You will need to reclear TSA security once you arrive in your departure terminal. For international arriving passengers, you must claim all checked bags at Customs and recheck with your departing airline, even if the bags are checked to your final destination!
If you are flying into the U.S. and connecting to a domestic flight, then a 50 minute layover will be insufficient. In that time span, you would have to deplane, go through immigration, collect your bags, pass through customs, drop your bags, reclear security and then make it to your gate for your next flight.