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.
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Atlanta's airport is divided into two terminals — the Domestic Terminal and the International Terminal — with five Concourses between them. Those Concourses are labeled A, B, C, D, and E. Concourse F is in the International Terminal, and the Domestic Terminal is home to Concourse T.
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. You can take the shuttle bus from the north of the terminal via the A1, A2 or A3 gates.
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.
Overall, passengers usually have to re-clear security for connecting flights, though there may be some exceptions depending on the airport and flight itinerary. To make this process easier, checking with the airline or airport ahead of time is recommended.