What Terminal is Sun Country Airlines at ATL?Sun Country Airlines operates from the Domestic Terminal (North Terminal) at Hartsfield-Jackson Atlanta International Airport (ATL). Passengers can complete check-in, baggage drop, and security screening at this terminal before heading to their departure gate. Since gate assignments may change, it is always a good idea to confirm your flight details before arriving at the airport. If you're wondering What Terminal is Sun Country Airlines at ATL, arriving early will help ensure a smooth and hassle-free travel experience.