[willvarfar]

Drones can be a serious hazard to larger aircraft. A drone could easily destroy a helicopter, rather like a bird strike can.

When the village of Laerdalsoyri burnt down in Norway in January the emergency services had to ground their own fire fighting helicopters because news drones were a hazard:

> police told Norwegian newspaper VG that a helicopter was being delayed because of suspected media drones taking pictures in the area.

> "It is important for us to stress that if someone is using drones, they must get them out of there," police spokesman Nils Erik Eggen said.

> "This could create a hazardous situation and may pose a danger to helicopters."

> The police could not say how many drones had been operating in the area.

So one could imagine a movie plot terrorist attack where unarmed drones fly over an airport and cause a total shutdown, or in the blockbuster version actually try and intercept a landing airliner.