how many terminals does the international airport you mentioned have?
Six terminals
John F. Kennedy International Airport
JFK has six terminals, containing 128 gates in total. 
what is airtrain jfk? An elevated people mover system and airport rail link serving John F. Kennedy International Airport can you mention one of its effect? Several projects were developed in anticipation of the AirTrain. what places does it connect? The airport's terminals with the New York City Subway in the Howard Beach neighborhood of Queens, and with the Long Island Rail Road and subway in the Jamaica neighborhood.
wiki:8307795
John F. Kennedy International Airport [SEP] Terminals
JFK has six terminals, containing 128 gates in total. The terminals are numbered 1–8 but skipping terminals 3 (demolished in 2013) and 6 (demolished in 2011). The terminal buildings, with the exception of the former Tower Air terminal, are arranged in a deformed U-shaped wavy pattern around a central area containing parking, a power plant and other airport facilities. The terminals are connected by the AirTrain system and access roads. Directional signage throughout the terminals was designed by Paul Mijksenaar. A 2006 survey by J.D. Power and Associates in conjunction with "Aviation Week" found JFK ranked second in overall traveler satisfaction among large airports in the United States, behind McCarran International Airport, which serves the Las Vegas metropolitan area.