Re: Drones can't crash airplanes (Oh yes they can!)
You are thinking of propeller driven planes which I grant may be difficult to take down with only a small drone. The speed of a single engine prop driven plane isn't usually much beyond 100 MPH.
However, commercial passenger carrying aircraft are almost ALL jets or turbojets (Props driven by jets).
The speed of a jet is considerably higher than a prop plane, therefore the impact forces will be greater.
If a single seagull or duck can disable a jet rotor then a single drone can do the same thing. Even debris on the runway is enough to knock one out of commission.