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The light aircraft itself cant do a lot of damage, neither can an automobile. But if you put some kind of explosive in it its highly dangerous. I cite this as an example of what a light GA aircraft could do if an evil-doer was at the controls. The difference between the car and the plane is that the car doesnt have access to the secure areas of major airports all over the world. This is a point I'm trying to make in my speech. To clarify, I state that this is the rare worst case scenario. GA pilots are good people who either fly for fun or for a living. I know that I would not want to jeopardize this freedom by skimping on GA security.
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My thoughts: One, if you put some kind of explosive on a person it is highly dangerous. Two, you can't get very much explosive on board a light GA aircraft and still take off; no such limitations for cars, trucks, etc. Three, whether it would be easy to notice a stranger at a local airport or not, I think it clearly would be easy to notice the stranger loading an airplane with explosive materials. And, four, nobody screams for security restrictions on Ryder trucks, and it's been made abundantly clear what one of those can be used for. The calls for increased security for GA light aircraft represent little more than knee-jerk reactionism from people you don't have any understanding of GA (or from people who have an axe to grind against GA anyway).
I'm not sure what you mean by "access to the secure areas of major airports all over the world." If you're talking about someone trying to ram an airliner with an explosives-laden airplane, there are much simpler delivery devices (it would, for example, probably be just as easy (perhaps easier) to ram a truck/van through the airport fence at most airports). If you're talking about getting close enough to airline traffic to transfer explosives onto the airliners, I'm not aware of any major airport at which a GA light airplane could get that close to a parked airliner (and someone would probably notice).
[Now stepping off my soap box, and slowly backing away.]
MF