I remember that. At first, there was no debris field. This two big engines would still be left, even if aluminum cowels were destroyed. And the tail would be left. the FBI was going around collecting all security video footage from cameras in the area around the mil HQ. If it was real, wouldn't they play it in endless loops like the twin towers CGI? Speaking of the twin towers, here is MIT report about engines in crashes: 3.3 Engines and wing damage The engines are the only components of the aircraft that can be considered approximately as rigid bodies. Their devastating power is unmatched until they encounter an object of similar weight and strength. In the experimental study in which an engine of a transport aircraft hit a thick concrete wall, the engine itself was crashed and fractured, so it was not rigid, [28]. However, in contact with less substantial members the engine could cut and plow through the various structural members of the WTC Towers until all their kinetic energy is absorbed. http://web.mit.edu/civenv/wtc/PDFfiles/Chapter%20IV%20Aircraft%20Impact.pdf Was there reports of the engines hitting other building down range from the twin tower impacts? The elevation alone would send those suckers pretty far. Interesting read as it talks about shearing forces of the concrete floors on aluminum, which never occured to me. Now the fuselage is getting engaged with one or two floors of the height w m = 0.9 o each. The floor is relatively narrow compared to the diameter of the fuselage and may in fact slice through the fuselage and cut it into two or three pieces. Wierzbicki [27] derived an approximate solution for plastic resistance of a blunt object cutting into thin sheet, such as tubular wall of the fuselage model. He identified the so-called “concertina” tearing mode, which consists of two diverging cracks enclosing a strip which progressively folds back and forth. A photograph of the damaged pattern induced by a rigid punch of width wo is shown in Figure 10. Which means, to my very limited physics understanding, that a lot of the plane forward energy was being absorbed by the concrete floors as it peeled a hypothetical plane apart.