You can see it all replayed here:
http://www4.passur.com/lga.html
Set date to Jan 15th, time to 15:25 and range to 10 miles.
You can see AWE1549 take off in green a minute or two in, from the centre of the sceen heading upwards. Climbs to about 3,400 feet and then starts a rapid descent followed by a tight turn to the left to reach the river. You can see one light aircraft heading up the river the opposite way at 1,000 feet take avoiding action and then go back for a look, accompanied by another, which seems to hover in the area.
Have a look at La Guardia on google earth and you can see that was his only option. He was down to 1,300 feet when he reached the river. 
Kevin
Very intresting! Love things like that!
Have some software on the laptop (acarsd maybe?) that displays planes on a map and the flight info. Can do it over the internet or by plugging it into my scanner! 
There is a box that you can get which will directly receive and plot the ADS-B data from the aircraft's Mode-S transponder.
http://www.hamradio.co.uk/kinetic-sbs-1e.shtmlIt's not exactly cheap but it's quite mesmerising to have a play with. You can sit in the above shop and watch all the traffic coming into and out of Heathrow. In addition to the ADS-B information (heading, speed, position, altitude, etc.) It captures the aircraft's 24 bit ICAO address, looks it up in various online databases and works out the type and regsitration of the aircraft, the carrier, finds its' flight plan and identifies what service it is operating, etc. 8-)
A plane spotter's dream.
Sadly, a little too expensive to buy just as a "toy".
I believe it can publish info to the web, so you might find people have set these up for public access.
Kevin