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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Vapor Trails Versus Turbofans

All five video frames show a dense vapor trail.
First frame shows vapor trail behind object hidden by post.

757s have turbofans.
Turbofans are propelled mostly by fans, not nozzle exhaust.
Turbofans do not emit vapor trails at low altitudes.

Only airborne source of such dense vapor trails is rocket engines.
Rocket engines leave dense vapor trails because they produce water vapor in concentrations causing it to condense immediately.

Missiles have rocket engines.

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