Hartsfield-Jackson Atlanta International Airport (ATL) is most famous for being the busiest and most efficient airport in the world by passenger volume, a title it has held for most of the last two decades. In 2026, it continues to serve as the "primary mega-hub" for Delta Air Lines, which operates its global headquarters and largest technical maintenance facility there. ATL is known for its unique "linear" layout consisting of two terminals and seven parallel concourses connected by the "Plane Train," an incredibly reliable underground automated people mover. Strategically, it is famous for its "two-hour flight" status—80% of the U.S. population is within a two-hour flight of Atlanta, making it a critical hub for domestic commerce. The airport is also recognized for its extensive Airport Art Program, which features permanent and rotating exhibits, including the famous "Zambezi River" forest walk in the transportation mall. Despite its massive size, ATL is frequently praised for its operational efficiency, managing over 2,500 arrivals and departures every single day with remarkable precision.