Ever wondered where that flight is?
Plane Finder is an app for the iPhone or Android device that lets you see in real-time exactly where a flight is in the sky, along with a ton of information about that flight!
Not only educational, but very useful in tracking where a flight is that you are interested in or waiting for. Check out the video and website for more information.
Another one that looks good is called FlightAware and can be found here. There are many more but these 2 stood out on my recent search in the app store and on Google. I have not had time to do my own review and the current reviews for this one did not look good, more on this after I investigate.