Take a look at this guys, he narrowly avoided a head on with helicopter N461SA coming in the opposite direction up the river at 1000ft! Looks like the heli took avoidance measures.
Go to 15th Jan, 15:25. Click on a plane for details. The A320 appears at 15:59:57
LaGuardia Airport - AirportMonitor - by Megadata - powered by PASSUR
Here's the track log from flightaware.com
FlightAware > Live Flight Tracker > Track Log > AWE1549 > 15-Jan-2009 > KLGA-KLGA