9-11 Research does not endorse all of the conclusions of this presentation.
For analysis of this issue, see The Pentagon No-757-Crash Theory: Booby Trap for 9/11 Skeptics
See the comments below.
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A Jetliner Did This?

Reconstruction of immediate impact damage using photos.
Maximal width of ground-level puncture damage is 90 feet (long red arrow).
Maximal height of puncture damage is 26 feet (top of second floor).

Windows remained unbroken, and masonry unscored, where wings and tail would have to have impacted.

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Comments by 9-11 Research added on 9/16/04

This photo montage of the pre-collapse facade is misleading because it superimposes photos from different vantage points. The vantage point in the final montage is from high above the building. But the spools covered in foam are from a photo taken from ground level. The superimposition has the effect of making the spools look like they are right against the building, when they may have been 60 feet from it.