LaGuardia Airport - AirportMonitor - by Megadata - powered by PASSUR
start time of 15:26, click on 'departures'. Incident a/c would be the green aircraft just north of LGA heading 360 on departure.
They crossed I-95 and over Brooklyn Park started a descending turn to the left. They would not have been over and airports(Teterboro or Westchester), and probably wouldn't not have been high enough to reach either airport. So their choices would have been highways(with many overpasses) trees/built up areas, or water.
Helicopter flying up the Hudson at 1000', just south of the G.W. Bridge, turned to the east to avoid the A320(1300-1400' AGL) gliding towards them, and then turned west apparently to assist.
Anyone get any links to liveatc for the event yet? The helo's radio calls might be interesting.
Also, check out
www.maps.google.com or google earth, and you can see how crowded the area is. I-95 is the major highway running east of the G.W. bridge.