“A Boeing 757-300 weighing 270,000 lbs flying at 500 miles per hour is easily going to penetrate any building that does not have thick concrete steel reinforced exterior walls (Nuclear Reactor Containment building)”
Pretty much. The rebar in a reactor dome is enormous. You can bounce most anything short of a howitzer shell off of it.
A guy I went to high school with was the pilot of American Airlines Flight 77, the one that the hijackers flew into the Pentagon. My dad had an office on that side of the Pentagon’s outer ring some 50 years ago. The Pentagon is a reinforced structure but not a match for an airliner.
I think the Pentagon might have held up against the airliner if they had not put windows in the Exterior walls.
My thoughts on the matter for what their worth.
All of those holes in the wall are stress locuses.
Actually, as I understand it, a howitzer would probably just scratch the paint on the exterior of the containment building.
I suspect these are far and away the strongest structures ever built.