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Every day, airports across North America handle thousands of flights, connecting travelers to domestic and international destinations. The volume of operations varies widely, with some airports functioning as major hubs that operate continuously and serve as important connectors for passengers and cargo.
The latest data from OAG, measured by the total number of available airline seats for August 2025, provides insight into which North American airports are the busiest. This metric considers all seats on both domestic and international flights arriving at or departing from a given airport, reflecting each facility's overall capacity and connectivity.
Hartsfield–Jackson Atlanta International Airport (ATL) in Georgia continues to lead as the busiest airport in North America and globally by available seat capacity. "Atlanta has continuously ranked as one of the busiest airports in the world when measured by passenger traffic, which has been contributed to by the immense presence, the hometown airline, Delta Air Lines plays at the airport. The airport is home to the SkyTeam carrier, which has its global corporate headquarters here." American low-cost carriers such as Frontier Airlines, Southwest, and Spirit also have significant operations at ATL. For August 2025, OAG reports more than 5.4 million available seats at Atlanta.
