LaGuardia is the smallest of the New York metropolitan area's three main airports. The other two are John F. Kennedy International Airport (JFK) in southern Queens and Newark Liberty International in Newark, New Jersey. LaGuardia is the closest of the three to Manhattan. These three airports are the largest airport system in the United States. They are the second most busy system of airports in the world by number of passengers. They are the first in the world in terms of total flight operations. In 2010, the airport had just under 24.0 million passenger. JFK had 46.5 million and Newark had 33.1 million. A total of about 104 million travelers used New York airports.