for high-ranking government officials. U.S. presidents Dwight D. Eisenhower and John F. Kennedy sometimes used the terminal when they landed at LaGuardia Airport. The terminal also contained the offices of flight simulation company FlightSafety, founded in 1951 by Albert Lee Ueltschi. The Port Authority announced its plans to renovate most of LaGuardia Airport in 1957, but Marine Air Terminal was excluded from these plans. The terminal reopened for commercial aviation on June 27, 1957, when Northeast Airlines leased the terminal for its shuttle services between New York and Boston. Private, non-scheduled, and military flights continued to use the terminal. That October, Northeast relocated Boston flights to LaGuardia's domestic terminal and started using the Marine Air Terminal for its flights to Florida. The swap took place because Gate 11 at the domestic terminal was too small for the four-engine DC-6Bs that were used on the Florida flights. Pan Am moved some of its remaining equipment from the Marine Air Terminal to Idlewild in 1958. By then, the Marine Air Terminal was no longer an important part of LaGuardia's operation; only five percent of the airport's 5.4 million passengers in 1959 came through the terminal. The New York Times described the terminal in 1960 as having "an air of decay and desolation", with a dirty skylight, broken equipment, peeling paint, and almost no passengers. In 1964, American Hydrofoils agreed to operate a shuttle hydrofoil service from the Marine Air Terminal to East 25th Street and Pier 11/Wall Street in Manhattan. After the Federal Aviation Administration banned non-scheduled airlines from operating regular flights and selling tickets in the 1960s, the Marine Air Terminal sat nearly empty for several years. The Butler Aviation Company, which managed LaGuardia's general aviation operations, had divided the walkway adjoining the terminal into a waiting room and an office, and there was a pilots' lounge next to the walkway. Butler leased the terminal and spent $200,000 to renovate the eastern portion of the main building. Following the renovation, the Marine Air Terminal reopened in October 1966 as a general aviation terminal. At the time, there were 400 daily general aviation flights at LaGuardia, about half of the airport's daily air traffic. The terminal was then known as Butler Marine Air Terminal. The main building's rotunda was repainted in the 1960s and was again supposed to be repainted in the 1970s. Aviation historian Geoffrey Arend advocated for the restoration of