Palo Alto Airport — Palo Alto, United States

PAO is Palo Alto Airport, a general aviation facility located on the San Francisco Bay shoreline in Palo Alto, California, in the heart of Silicon Valley. The airport is one of the busiest single-runway general aviation airports in the United States, heavily used by private pilots, flight schools, and corporate aircraft owners given the wealth and tech-industry concentration in the surrounding area. PAO does not offer scheduled commercial airline service; instead it caters to small aircraft, helicopters, and flight training operations. Its location near environmentally sensitive baylands has made noise and environmental management an ongoing consideration for airport operations. PAO remains an important general aviation reliever airport for the broader San Francisco Bay Area.