Q: Where can I buy an iPad 3 at John F Kennedy airport (new York)

I don't beleve that there is any authorized reseller of iPads at the JFK airport.

Actually I just found out there is an authorized (did not confirm) shop call istore at JFK 8th Terminal

http://istoreworld.com/us/retail/istore-jfk-airport/

But, after speaking with representative at this location, confirming that in US there is NO DUTY FREE on electronics. So you will have to pay 8.8% tax on electronics you buy from this store at JFK.

Hope this will help others.