We used to use this one at the airport. It's free and pretty accurate. Was very helpful in tracking
business jet arrivals.
http://flightaware.com/live/airport/KMMU
You can change airports on the left hand side, be aware that it doesn't work well in Africa or alot
of Asia.
Last two times my g/f had to fly for business (she's a Chemist for Dr. Pepper).. once for training in NY and once to train others in Plano.. I flied on FSX with the same plane using the same route as her. I use flightaware to track her progress and compare it to mine. It's actually quite fun!
