It's quite a common trick in airplanes. Someone drew a "50" over half of the Netherlands for the 50th anniversary of the flight school I teach at. In airplanes

It's quite a common trick in airplanes. Someone drew a "50" over half of the Netherlands for the 50th anniversary of the flight school I teach at. In airplanes it's not that hard. You can draw the route on your iPad on the ground, then load those GPS points into the plane via Bluetooth and fly it. A modern autopilot could even fly it for you, but you'd have to sit there being bored for a few hours. If you do it at low altitude in uncontrolled airspace you're free to draw whatever you want. In controlled airspace you may get ATC interfering with your drawing. But even that can be coordinated, mapping companies do that all the time, fly very specific patterns in coordination with ATC.