First movie was pretty good, with some interesting questions.
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Second movie had a major flaw that I spotted instantly:
Pyroclastic cloud! WTF!
Whoever made that does not know what that really means. Only a volcano is capable of such an action. Had that actually been a "pyroclastic" cloud, lower Manhatten would no longer exist, and the ground would have been littered with human-shaped chunks of carbon. THAT is a pyroclastic cloud.
If you ever see one in real life, it had better from many miles away and from the top of a high hill, or else you are already dead. At 3,000 degrees Celsius and moving at 300+ kph: you cannot hope to outrun or survive such a force of nature.
Using the word in this instand endangers public knowledge of what it really means by giving them false information. Do not listen to this garbage.
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On a side note though, I too have found an interesting video about this event. Probably more conspiracy theory, but it asks some interesting questions to which we may never have answers...
Secret of 9/11