Again, your charlatan masters are using the maximum velocity of a 707 when the designers state they imagined a slow flying 707 lost in the fog.According to architects the towers were designed to withstand a 707 airplane crash. Yes a 767 (the jet that crashed into the south tower) is bigger but here are figures from structural engineers:
The kinetic energy released by the impact of a Boeing 707 at cruise speed is
= 0.5 x 336,000 x (890)^2/32.174
= 4.136 billion ft lbs force (5,607,720 Kilojoules).
The kinetic energy released by the impact of a Boeing 767 at cruise speed is
= 0.5 x 395,000 x (777)^2/32.174
= 3.706 billion ft lbs force (5,024,650 Kilojoules).
From this, we see a Boeing 707 would smash into the WTC with about 10 percent more energy than would the slightly heavier Boeing 767. A Boeing 707 would do more damage than a Boeing 767.
P.S. How could a heavier plane cause less damage? Due to better aerodynamics of the 767 the designer engineers could use thinner metal and secondary parts were made from carbon fiber. They did this to improve energy efficiency. Higher efficiency planes helped to keep the airlines afloat.
Impact energy of the attacks is around 10 times what the designers expected.