William Wixon wrote:

i don't know very much about RC aircraft but only one time i was at a RC
airplane get together, some guy was flying his large very expensive RC
airplane and all the sudden he started yelling (screaming) for
someone/everyone to turn off their radio transmitter, apparently someone had
inadvertently gotten onto his frequency and he completely lost control of
his airplane. didn't know that was a hazard for RC airplanes, was an eye
opener. (whoever it was turned off their transmitter in time and the guy
recovered control of his airplane.) wonder if there are now transmitters
that aren't vulnerable to that or if there even might be some sort of
encoded secure transmitters? must be huh for the drones and uav's the
military uses.

There are full auto-pilot modules available for both RC planes and
helicopters that can keep the craft stable in the event of a radio link
failure.