Take the Air Train (sings everywhere in the airport) direction Jamaica Station. At Jamaica Station take the elevators to get downstairs to the Subway station. Once there take the "E" subway direction Manhattan/ World Trade Center. Ask at the subway booth where you should get off or transfer subways. You buy the ticket for the Air Train once you GET OFF the train at the Jamaica station. Price Air Train: $7. You can buy at the same time the subway ticket $2.25 per ride. Good luck!
Take the Air Train (sings