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@niclas 15% of an airplane is titanium and steel, there's plenty of 25-30% fiberglass which guess what is as strong as steel.
What I've presented to you 1st is the kinetic energy that the plane exerted on the building but guess what there's also a reaction force that comes from the building basically pulverizing the plane in less than half a second. The reaction force must have been humongous vs the airplane kinetic energy. The reaction force more likely destroyed every possible chance of those beams having integrity and continuity very important in tall buildings. Those 56 and 100 minutes that burned were more than enough to finish the 'job'.
Without those fires building would be still up but on a brink of collapse.