If you've ever looked up in the sky and wondered where a plane might be headed, Wolfram Alpha might just know the answer. The search engine, which recently began incorporating data from the FAA can now, with a five-minute delay from real-time data, use a flight's speed, heading and altitude to offer a projection of a plane's position. A search for 'flights overhead' via the Wolfram Alpha web site or app will use your location to pinpoint flights that should be visible to you. That string currently only works if the flight has at least one endpoint in the United States, so tracking international flights might be limited. Even so, this should allow you to look up flight delays, check when the next flight will be, see a cool interactive sky map and track a specific flight, of course. You'll have no valid excuse for being late to pick a friend up from the airport ever again.