Must I change terminals or do anything else while traveling the same airline the whole journey?

I plan on taking an exclusively Delta flight from Birmingham Shuttlesworth to Bangor international and I'm worried about having to change terminals or go through security again when i stop for my layovers in Atlanta and JFK International, or if i can keep layovers shorter by being able to remain in the same terminal through the whole journey. Thank you for your time and help, and have a great day!

Each airport is different. At Atlanta all the terminal concourses are connected and you won't have to go through security again.

At JFK Delta operates from Terminal 2 and Terminal 4. These terminals are not physically connected. If your flight from Atlanta arrives at one terminal and your flight to Bangor departs from the other you will have to leave the terminal, take the AirTrain to the other terminal and go through security again. Your luggage, though, will be checked from Birmingham all the way through to Bangor.

You won't know what terminal and gate your flights will use until the day you travel, and even then the gate may change right up to the boarding time.

All of the concourses at ATL are connected inside security. If you have to get from one to another, just go down to the train and take it in the right direction to the next one.
If you have to go from one of Delta's terminals to the other at JFK, you can use the Jitney shuttle that connects the two inside security.

Also, you aren't on an exclusively Delta flight. You are on three Delta flights.

In Atlanta, they have concourses so you do not have to go through security again. You may have to switch concourses but it is pretty easy in Atlanta. They have a train that connects all the concourses or you can just walk.

As for JFK, Delta has 2 terminals. Depending on which one you arrive at and which one your flight departs from, you may or may not have to switch.

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