I downloaded a similar app on my iPad (PlaneFinder HD) and found it very addictive, you see a plane in the sky and it'll tell you the type of aircraft, which airline, where it's going from & to, the speed, altitude & flight number. It covers all continents so you can look at aircraft over the US & Asia too. I'm by no means a plane spotter but I quite enjoy using the app to pass the time when I'm bored.