The airport is located near the junction between Interstate 95 and Interstate 78 (both components of the New Jersey Turnpike), as well as U.S. Routes 1 and 9, which has junctions with U.S. Route 22 and Route 81. The airport handles almost as many flights as John F. Kennedy International Airport (JFK), despite being 40 percent of JFK's land size. The City of Newark built the airport on of marshland in 1928 and the Army Air Corps operated the facility during World War II. After the Port Authority took it over in 1948, an instrument runway, a terminal building, a control tower and an air cargo center were added. The airport's original 1935 central terminal building is a National Historic Landmark. EWR employs more than 24,000 people.