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If you check the Priority Pass site, JFK Terminal 1 has 5 different lounges!
There is a Turkish Lounge, KAL Business Lounge, Primeclass Lounge, Lufthansa Business Lounge, and Air France Lounge.
Of the ones I have been to, I think Lufthansa Business Lounge is the best lounge in JFK Terminal 1.
If you have time, go check out multiple ones and report back which one you liked the most.
prioritypass.com
New York NY JFK International JFK Lounges - JFK Airport Guide and lounges. | Priority Pass
With several lounges at New York NY JFK International Priority Pass customers can refuel, refresh and reconnect before the flight.