The picture was taken at approximately 12,000 feet over New Jersey, flying East toward Manhatten. You can see the flight path would take you over the Hudson River, Cental Park, the East River, and out over Long Island.
Click on the picture to enlarge it and you can see the runways at La Guardia at the 10 oclock position and the runways at JFK at the 2 oclock position. The runways at Newark are under the nose of the airplane out of view.
This is some of the busiest airspace in the world. On a clear day like this you can see arrivals and departures at Newark, LaGuardia, and JFK at the same time. A lot of jets in a small airspace.