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Originally Posted by Pierre
As I mentioned to Graham, I do have some knowledge of structures. There are impact standards that have to be applied to structures of a certain height. The Pentagon had several walls of thick reinforced concrete. The jets that hit the WTC only went essentially through glass and steel and they disintegrated almost immediately. Yes they left an entry hole but neither plane made it through the building. The Pentagons construction is far beyond that of the WTC yet we are to beleive the plane distintegrated on impact but still managed to penetrate the 3 rings of the building.
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The WTC would have had a concrete centre would it not for the lift shafts etc?