Frontier Airlines ATL Terminal  Based at Hartsfield-Jackson Atlanta International Airport (ATL), Frontier Airlines is operated out of Terminal N (North). One of ATL's two main terminal buildings, the Domestic Terminal is where the majority of domestic flights are processed. Passengers may easily access baggage claim areas, security checks, and check-in kiosks from Terminal N. Travelers can also choose from a variety of stores, restaurants, and services. It is advised that passengers using Frontier Airlines arrive at least two hours prior to departure in order to guarantee a seamless and efficient check-in procedure.