Phoenix Sky Harbor International Airport is a joint civil and military airport located 6km west of downtown Phoenix. It has three runways of 11,489ft (3.5km), 10,330 (3.1km) and 7,800 feet (2.4km), along with three Fixed Based Operators and handling agents. Customs clearance is available and airport slots are not required. The airport operates 24 hours a day. It has two VIP lounges, located in Terminal 2 and Terminal 4. It is Arizona’s largest and busiest airport, and among the largest commercial airports in the US.