The Pentagon was make from mulitlayer of impact resistance materials, marble, reinforced concrete, sand. All designed to resist the impact of a bomb or a missile. The WTC wasn't designed for that at all. It was designed to handle a hit, but not to resist one, the Pentagon is.

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Howling from the Shadows

It must be fun to lead a life completely unburdened by reality. --- JayUtah

You can't reason an irrational person out of an irrational belief. --- Noclevername

Apollo: The History and the Hoax
Enter the World of Athran