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...and the larger fragments carry-through the windows into the structure.
The plane in question "supposedly" did remain in tact whether it be a crumpling mass of rolling fire and aluminum, and had enough force and mass, to go through 9 feel of reinforce steel concrete, and punch out a perfectly round 10 foot diameter hole in the back of the C- Ring. So you've just shot down your own argument. Then you show us a video where a similiar plane cannot go through 3-6 feet of concrete?
Impact damage to the interior of the Pentagon was primarily on the first floor, and extended in a tapering swath from the first-floor facade puncture to the vicinity of the C-Ring punch-out hole.
On the first and second floors, the Pentagon has continuous interior space extending from the facade to the inner-facing wall of the C-Ring, joining the C-, D-, and E-Rings. This is because the light wells between the C- and D-Rings and between the D- and E-Rings only descend to the bottom of the third floor. The only structural elements interrupting this space are columns apparently spaced on 10-foot centers along the direction perpendicular to the facade, with each first-floor column having a square cross-section measuring 21 inches on a side.
A figure on the left shows a path from the center of the facade impact puncture to the center of the C-Ring punch-out hole. That path could describe the path of fuselage debris from the facade to the C-Ring wall, where it could have produced the punch-out hole. It shows that there was a narrow path for that debris between the columns left standing by the crash.
It's just, this video isn't up to standard, sorry.