Earlier quoted context omitted.
How do you expect to shoot them down? They are small and very quick and disappear shortly after appearing.
Stand-by drone-intercepting drones? Tracking them is a need first and foremost. How about a down-facing radar on top of the Aviation Control Tower?
a couple of RPG sized rounds dropped from 10000 ft up could easily close runways and shutdown an airport for hours. hell just being there and being UFO could lead to all sorts of flight re-routing and chaos