I should clarify something: here in the US, many people will use an incorrect choice of words, to describe something. For example, if they said "the plane penetrated the building", they may have meant that part of a plane penetrated the building. Still logically correct, but innacurate.
IMO, the right engine penetrated the building, as the plane (a 757) hit the wall, at roughly 50 degrees, turning counter-clockwise to finish the impact. All remains burned. Fuel was splattered in the general heading of the plane, entering (in part) the building.
The NTSB will publicly release its report, in a couple of years, as NTSB records are public, once the investigation is complete and closed. It might not have those details, as NTSB reports are usually limited to improving flight safety, not reconstructing a terrorist attack.
The wtc isn't flimsy, of course, but relatively flimsy, if you compare it to the Pentagon. The structure of the WTC is of a civilian, lightweight design, for office use. It had to be lightweight because the underlying structure would otherwise have to be massive.
The last links you provided may have innacurate information, or even propaganda. That particular section of the Pentagon had in fact just been rebuilt, and reinforced. It is a fact that in past history, great secrecy surrounded the details of critical buildings. There was also a public report where a worker in that section reported suffering only minor injuries, due to the type of reinforcement applied specifically to limit injuries due to flying glass, from the windows (from a bomb).
Historically, the Pentagon was built after Cheyenne mountain, which was itself built at the end of WW2 (around 1945-1946), at the height of the nuclear fear. It is a granite mountain that was hollowed out, reinforced then fitted with a steel hull, mounted on springs. It was all built within about a year. It has four floors, and is X shaped. It constitutes NORAD command. (you don't want to know the price tag, trust me!)
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