It's different from "I'm going to fly a robot into an airplane". My point is that gok's summary of this threat is rather off the mark. As for gok's analogy to a bomb threat... enough has probably already been said about that.

I suppose a bomb is a threat whether the plane flies or not, while a drone is only a threat if the airport decides to fly planes despite knowing there are drones in the area.

Apply common sense: One threatens violence, the other threatens inconvenience. Duh. If a "fake bomb threat," were called, it would have no effect. Bomb threats have to be credible to have weight, which would also an act of terrorism, meant or not.