Philadelphia International Airport — Philadelphia, United States

Philadelphia International Airport, coded PHL, ranks among the older continuously operating commercial airports in the United States, with roots reaching back to the early aviation era before growing into a major hub, first for US Airways and later for American Airlines following the 2013 merger that folded US Airways into the larger carrier. Positioned along the Delaware River south of downtown, PHL provides a busy international gateway for the Philadelphia region, supporting transatlantic routes to Europe alongside dense domestic connections up and down the East Coast. The airport sits close to historic sites central to American independence, including Independence Hall and the Liberty Bell, giving visiting travelers easy access to the city's colonial-era landmarks. Cargo operations at PHL also handle substantial freight volume, supported by the region's pharmaceutical and manufacturing industries, making the airport an economic anchor well beyond passenger traffic alone for the greater Delaware Valley area.