If you have a passport up to date you can leave alone, be careful not to arrive late at least 2 hours before your flight.
You can go out but as they say you have to go back in and in general the lines can be more than 1 hour and NYC is about 1 hour away, although it works for you, by subway it would be ideal because an Uber left me the last time in 80 US
Of course, if the important thing is to take into account being the hours before the airport check-in requires
Yes you can leave the airport
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