Located approximately 13 miles (21 kilometers) away from downtown, the San Francisco International Airport sprawls over 150 acres (61 hectares) of open land. Being the biggest airport of San Francisco Bay Area, it provides services across North America, Europe and Asia. Also the 20th largest in the world, SFO serves as a hub for United Airlines and Virgin America. With facilities like restaurants, spas, WiFi and shopping areas, the airport is also famous for the SFO Museum, which is a major tourist attraction.