Hartsfield-Jackson Atlanta International Airport (ATL) is famously the primary global hub for Delta Air Lines, which accounts for roughly 75–80% of the airport's total traffic in 2026. However, nearly every major domestic and many prominent international carriers operate out of ATL. Domestic travelers will find a heavy presence from Southwest Airlines (which uses Atlanta as a major base), along with American Airlines, United, Alaska Airlines, and low-cost carriers like Frontier and Spirit. On the international side, Atlanta is a key gateway for SkyTeam partners like Air France, KLM, Korean Air, and Virgin Atlantic. Other major international players include British Airways, Lufthansa, Qatar Airways, and Turkish Airlines. In 2026, the airport continues to be the world's busiest by passenger volume, serving as a critical connection point for flights between the Americas, Europe, and Africa.