The answer to the hi-jackings and this terrible flying bomb, if not just blowing up the plane by plcing bombs aboard, would appear to be a plane designed with no access to the flight cabin?

The security should be then easier to handle, as you would just have to ensue that only the intended flight crew were on board.

They would be no point in anyone in the plane threatening other passengers or staff, as they could not then control the plane.

Is this just too obvious or just too expensive? Do we now have any choice?