Phoenix Sky Harbor International Airport is one of the busiest airports in the United States, serving as a major hub for the Southwest and a key connection point between the continental US, Mexico, Canada, and international destinations. Located just three miles east of downtown Phoenix, it handles tens of millions of passengers annually and is a significant economic engine for the state of Arizona. The airport is operated by the City of Phoenix and serves as a primary hub for American Airlines and a major focus city for Southwest Airlines. Its position in the Sun Belt has made it one of the fastest-growing major airports in the country, reflecting Phoenix's rapid population and economic expansion. Sky Harbor is known for its relatively efficient layout and consistent rankings among the busiest airports in the US by passenger volume. It has undergone substantial modernization efforts in recent decades, including terminal consolidations and upgrades to roadway and transit infrastructure.