If you are examining your travel itinerary to confirm What Terminal is at Delta Airlines at ATL, the answer depends entirely on your flight's destination. For all domestic routes within the United States, your journey begins at the Domestic Terminal South for check-in, security, and baggage claim. However, if your flight is heading to an overseas destination, your ticketing, baggage drop, and security screening will take place at the Maynard H. Jackson Jr. International Terminal on the eastern side of the airfield.