Pittsburgh International Airport (IATA: PIT, ICAO: KPIT, FAA LID: PIT) — originally Greater Pittsburgh Airport and later Greater Pittsburgh International Airport — is a civil-military international airport in Findlay Township and Moon Township, Pennsylvania, United States. About 10 miles (15 km) west of downtown Pittsburgh, it is the primary international airport serving the Greater Pittsburgh Region as well as adjacent areas in West Virginia and Ohio. The airport is owned and operated by the Allegheny County Airport Authority and offers passenger flights to destinations throughout North America and Europe. PIT has four runways and covers 10,000 acres (40 km2). PIT is the largest civil/public airport in terms of land area in the state of Pennsylvania.

First opened in 1952, the airport was initially served by five airlines and became a small hub for Trans World Airlines for over two decades. The airport underwent a massive $1 billion rebuilding and expansion which was largely designed to US Airways' specification so it could become one of their major hubs. Completed in 1992, the new airport was one of the most innovative in the world, dubbed the "airport of the future" by the New York Times, and helped to pioneer modern airport design with its X-shape to reduce distance between gates, underground tram to transport passengers around the airport, and array of shopping options, all of which were cutting-edge at the time. Traffic peaked at 20 million passengers in the late 1990s, and US Air peaked at 542 flights and 11,995 employees at the airport in 2001, and the airport was an important pillar of the Pittsburgh economy. However, the downturn in air travel immediately after September 11 attacks badly harmed US Airways' financial state.