Even though it would be nice if we could use the honor system, or at least assume that anyone bringing a weapon on a plane has no intentions of using it on the plane, the relatively minor difference between a gun and a gadget is that you aren't supposed to use a gun on a plane at all.

And for what it's worth: I have been on commercial passenger flights which did not involve going through airport security or baggage screening. It was a lot like hopping on a bus. (As far as I can tell, these security requirements only apply to international airports and perhaps certain classes of aircraft.) Given these flights were going to northern communities, there probably were guns on board. You probably wouldn't find international terrorists among the dozen or so passengers, but there is a reasonably high probability that one or more of the passengers would be smuggling drugs. Yet I was never terribly worried because very few people go bezerk.