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
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Extent of Impact Damage

A section of the west block collapsed 25 minutes after attack.
Photos taken between impact and collapse allow reconstruction of impact damage pattern, in spite of partial obstruction due to smoke.

Area of broken-away walls is outlined in red.
No windows above second floor are broken (between yellow arrows).

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