Be that as it may, I just want him to answer my simple question - I am sure he is feverishly Googling as we type.
Wouldn't happen - plane's made of aluminium; building's make of steel columns. The building provided necessary impact absorption by literally tearing the plane apart with the building's structure. (unlike the Pentagon, which was more like solid rock, and carried forth the impact energy of the plane, as it was transmitted to the Pentagon's materials).
Either way, take some alumnium foil, roll it into a roll, several layers thick, and then drive it into a wall, to get an idea what happened. The few steel components of the plane (turbines, landing gear, etc...) appropriately traveled on, broke off, and were found in the rubble.
Ditto with the impact site at the Pentagon, where most, if not all, parts of the Boeing 757 were recovered and identified. No big mistery, really.





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