Via TUAW:
Daily iPad App: FlightRadar24 lets you spot planes using your iPhone
FlightRadar24 Pro is a universal app so it runs on the iPhone and the iPad. It’s convenient on the iPhone, but I prefer the slightly larger screen of the iPad mini, which is perfect for a visual, mapping app like FlightRadar24. When it launches, FlightRadar grabs your location and shows you the planes that are near you. The app is regional so you can see planes even when there are none directly overhead. It’s also a real-time view so the planes move along their flight path while you have the app open. When you tap on a plane, a pop-up window shows information about the plane model, the flight and the plane’s current speed and altitude