Frontier Airlines ATL Terminal Based at Hartsfield-Jackson Atlanta International Airport (ATL), Frontier Airlines is operated out of Terminal N (North). Travelers may enjoy a range of dining and retail options while they wait for their aircraft at this well-known terminal, which is renowned for its efficiency and contemporary amenities. As a low-cost airline, Frontier Airlines concentrates on offering accessible travel with necessary amenities. To ensure enough time for check-in, security screening, and any extra services like baggage check or seat selection, passengers should arrive at the terminal well in advance of their scheduled departure.