Philadelphia International Airport (PHL) is the largest airport in the Philadelphia region and the 11th busiest airport in the world in 2008 in terms of traffic movements. Most of PHL is located in Philadelphia proper, while the international terminal and the western end of the airfield are located in Tinicum Township. 

Philadelphia International Airport is a domestic hub and the primary international hub of US Airways. US Airways uses Terminal A West, the international terminal, for flights to Europe and the Caribbean. Terminals B and C are used exclusively for domestic US Airways flights, and US Airways Express regional flights use Terminal F. Southwest Airlines, a major domestic low-cost airline, began flights to PHL in 2004 despite its business model of utilizing secondary airports. Southwest Airlines operates its flights from Terminal E along with several other airlines. UPS Airlines operates a regional freight hub at the airport.
PHL is connected to Center City by the SEPTA Airport Line, which has four stations throughout the airport and travels to 30th Street Station, Suburban Station, and Market East Station in downtown Philadelphia. The Airport Line costs $5.50 one way for trips to downtown Philadelphia. Taxis charge a flat rate of $25 from the airport to downtown Philadelphia.
Northeast Philadelphia Airport
Northeast Philadelphia Airport, located in the Ashton-Woodenbridge neighborhood of Northeast Philadelphia, is used for general aviation flights. It is the sixth busiest airport in Pennsylvania, and has two runways. In 2006, the airport had an average of 289 aircraft operations per day, and 203 aircraft based at the airport.