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Originally Posted by AVGWarhawk
The trade centers were constructed with a exoskeleton as support. The persons who took control of the planes obviously studied these buildings and it's construction thus understanding it's weak points creating a possible collapse. They studied well and found that hitting the corners of the building could create a unstable structure producing a collapse. Of course we know the results. This was well planned and well executed.
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while i do not disagree with your general point, i'd like to say that it is not necessarily true that the attackers fully understood the weaknesses of the structure.
Firstly, from what is known, the targets were chosen not for their vulnerability but for their symbolic value
Secondly early reports from Bin Laden's camp reported a reaction of surprise that the buildings collapsed completely