That's a very good design problem, an open-ended problem. I don't think that we have such a thing right now. When there were all the bird strikes and the impacts, lots of research had been done around that. I'm sure we can look into that to see how we can provide a kind of firewall for the drones, as well. Right now, I think regulations where there is a safe zone around the airport and around people is a good way to go. I don't think we have such a shield right now, as far as I know, but that can be looked into. I don't have the answer to this, but that's a very good design problem.
On December 6th, 2016. See this statement in context.