Is my layover long enough?

I have a layover in Dallas, I believe I have exactly an hour to get from Terminal A to Terminal D. I don't think I'll have to go through security again since all terminals are connected but I've heard it's a pretty big airport so I might be cutting it close. Any information will help!

Take the tram, unless your flight is quite late it should be fine https://www.dfwairport.com/dfwucm1prd/groups/public/documents/webasset/p1_007097.pdf

DFW is a pretty big airport as it is the main base for American Airlines. However I think you should have enough time. Know also that sometimes airlines pad their schedule so you may actually have more than an hour to connect. My suggestion is to see if you can get a seat closer to the front of the plane so that you can be one of the first to get off when the plane reaches the gate. Also you can ask the flight attendant as you get closer to landing what gate you will arrive at and what gate your connecting flight departs from. Then you can consult the airport diagram located in the back of the American Airlines' in-flight magazine so you know where you need to go.