[TomCollins]

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He makes the same mistake as many other documentary film-makers. He exaggerates a few claims which are not correct and thus bring down the overall credibility of the film. I.e. he says the fire could not bring down the building. The fire could definately bring down the building. Fire fighters don't like lightweight buildings like WTC since they do not absorb high amounts of energy.

I personally think the Pennsylvania plane was shut down though.

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If it was shot down, it would have broken apart in the air. The impact crater is consistent with a nose-dive at a high rate of speed (most crashes are glides into the ground at a slower rate).

I don't think it's unreasonable to think it would have been shot down if it was airborne much longer.