Plane Finder AR is a $3 app that lets you stick your phone in the sky and see the flight number, speed, elevation, origin, and destination of planes as they fly. The planes need to be publicly displaying this data and not every flight does that, certainly not military flights. So does this serve any actual purpose? Is anything gained by doing this? No, absolutely not. Plane Finder AR falls squarely in the Hey Neato category. But it sure is neato. It's the Mayor of Neatotown.