Phoenix Sky Harbor International Airport (PHX) is a public airport located three miles (5 km) east of the central business district of Phoenix, a city in Maricopa County, Arizona, United States. It is Arizona's main international airport and one of the largest aviation facilities in the American Southwest. Currently, Phoenix Sky Harbor International Airport is the ninth busiest airport in the United States in terms of traffic.
Sky Harbor has been operating under its current name since prior to 1935, when it was purchased by the City of Phoenix. In the 1950s it was serviced by four airline companies. Today, the airport is the primary hub for Tempe-based US Airways, and is also the third-largest departure point for Southwest Airlines, the airport's second largest operator. Since beginning service in 1982 Southwest has grown to capture more than 34 percent of the market share. Since 1990, Southwest traffic from PHX has increased more than 352 percent.