[BigBobber]

There is a difference between a bomb and something that looks like a bomb.

Are you implying Islamic terrorists do not know how to make strap-on bombs? This is by far their favorite way to kill people.

On 9-11 there was no way to prevent someone from bringing a bomb onto a plane.

[Pukka Puck]

That they know how to make strap on bombs is indisputable. That they know how to make strap on bombs that they can smuggle into the cabins of airplanes is not proven. In fact, in order to accomplish their mission, something that looks like a bomb to an intimidated plane crew would work as well as the real thing. There have been other cases of airplanes hijacked by objects that looked like bombs but turned out not to be bombs.

Obviously, it would be easier and more certain for the terrorists plans to bring something onto the plane that looked like a bomb, but was not a bomb, thus would not be detected by screeners.

Or is this over your head?

[Pukka Puck]

In case you didn't notice, the object on 9/11 was not to blow up planes with bombs, but to fly airplanes into important governmental and financial institutions.

I hope this helps.