It's certainly real, the flight path is being tracked in real time by thousands of receivers. You'd need to fly around your transponder to make that, at which p

It's certainly real, the flight path is being tracked in real time by thousands of receivers. You'd need to fly around your transponder to make that, at which point it's not illegal any longer. But if you started DDoS'ing a single point in airspace you're going to go to jail very quickly.