3 buildings collapsed in freefall

Two aircraft whose fuel burns 1000 degrees cooler than whats needed to induce metal fatigue and failure into the spars of the WTC towers resulted in 3 buildings collapsing in freefall. An aircraft made out of carbon fiber and aluminum hit and penetrated 3 rings of the most heavily fortified building in the world, penetrating 6 walls made of structurally re-enforced concrete when if you look at some footage of an F-4 flying at MACH 1 into a concrete wall of the same thickness it literally disappears with no damage to the walls.