[MoralSense]

[O]fficial said it would be "extra-ordinarily difficult" for a light plane to crash into a large passenger plane due to collision avoidance systems in larger airliners.

Not if the small aircraft turns off his transponder, which is the only way automated collision avoidance system can sense another aircraft.

Also not if the airliner is on the ground, standing in line with a bunch of other loaded airliners on a taxiway.

[Lonesome in Massachussets]

Excellent point.