<P> The Staten Island Railway rapid transit system solely serves Staten Island, operating 24 hours a day . The Port Authority Trans - Hudson (PATH train) links Midtown and Lower Manhattan to northeastern New Jersey, primarily Hoboken, Jersey City, and Newark . Like the New York City Subway, the PATH operates 24 hours a day; meaning three of the six rapid transit systems in the world which operate on 24 - hour schedules are wholly or partly in New York (the others are a portion of the Chicago' L', the PATCO Speedline serving Philadelphia, and the Copenhagen Metro). </P> <P> Multibillion - dollar heavy rail transit projects under construction in New York City include the Second Avenue Subway, the East Side Access project, and the 7 Subway Extension . </P> <P> New York City's public bus fleet is the largest in North America, and the Port Authority Bus Terminal, the main intercity bus terminal of the city, serves 7,000 buses and 200,000 commuters daily, making it the busiest bus station in the world . </P> <P> New York's airspace is the busiest in the United States and one of the world's busiest air transportation corridors . The three busiest airports in the New York metropolitan area include John F. Kennedy International Airport, Newark Liberty International Airport, and LaGuardia Airport; 130.5 million travelers used these three airports in 2016, and the city's airspace is the busiest in the nation . JFK and Newark Liberty were the busiest and fourth busiest U.S. gateways for international air passengers, respectively, in 2012; as of 2011, JFK was the busiest airport for international passengers in North America . Plans have advanced to expand passenger volume at a fourth airport, Stewart International Airport near Newburgh, New York, by the Port Authority of New York and New Jersey . Plans were announced in July 2015 to entirely rebuild LaGuardia Airport in a multibillion - dollar project to replace its aging facilities . Other commercial airports in or serving the New York metropolitan area include Long Island MacArthur Airport, Trenton--Mercer Airport and Westchester County Airport . The primary general aviation airport serving the area is Teterboro Airport . </P>

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