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Busiest airspace and busiest airport are two different things, technically.

The airspace that combines JFK, LaGuardia, and Newark, is the busiest airspace in the US.

It's a crazy airspace. Add to that Teterboro, 12 miles from NYC and Republic ~20 miles from NYC, along with all the heliports on the Hudson.

I don't envy anyone having to work in that airspace in any capacity.