I would find it hard to believe that airliner passenger stuff applies to GA.
For starters, you can carry all kinds of stuff in the hold (checked baggage). This includes guns (obviously you need a firearm or shotgun permit to carry one about in the first place but that's a separate issue).
What relevance is the "in the hold" distinction to GA?
Common sense would seem to be more important. I would be concerned about carrying a flammable liquid container that was leaking, or a laptop with a huge lithium polymer battery. I suppose that one advantage of a Cessna is that you can always open the door and chuck the laptop out
