https://www.youtube.com/watch?v=2zt1oTYhcgo
Take especially note of how a wooden telephone pole cuts off an aitplane wing in a real-life crush-test simulation:
https://youtu.be/2zt1oTYhcgo?t=65
Apparently the logic here is "If a wooden telephone pole cuts an airplane wing off in a ground test, then a jet ramming a building cannot cut the 14" steel beams."
The right way to figure this is simply impact velocity and total momentum of impact, which is based on the ballistic coefficient. At time of impact of high velocity aluminum with a steel beam, the aluminum instantly turns to liquid and continues forward in the same direction. One example is waterjet cutters. High velocity water cuts steel, stone, etc.
Analogy with the tree is false due to difference in impact velocities. Tree impact looks like at the most 100 mph, jets hitting skyscrapers more than four times that. Remember that each doubling of the speed quadruples the momentum.....
I do remember that. However, your analogy to water jet is false as the aluminium, even if it got liquefied, would also become dispersed from contact with uneven surfaces - quite the opposite from a directed water jet. Also remember that the mass of the engines and the mass of the wingtips is different, with different thicness and breaking point : there would have been distortion and would not have gotten the perfect cartoon-cut-out, but rather a jumble of damage, even if your water-jet therory was right.
http://pilotsfor911truth.org/forum/index.php?showtopic=8714
http://pilotsfor911truth.org/forum/index.php?showtopic=8764
Someone rally should do an experiment - accelerate an airplane wing to 400 mph (or maybe slightly less - at that speed the airplane would have already been unstable at such a low altitude) and run it into a steel beam.
And I love it when people do experiments. Here' some more:
https://www.youtube.com/watch?v=VvQDFV1HINw
You happen to be wrong about (bolded above). Ever heard it said that a person falling off a bridge into water hits a surface as hard as concrete? It's strictly a matter of momentum and inertia. A "liquid" like kerosene at 500 feet per second tends to continue going exactly in the direct of its momentum. It does not just "flow around things," on the contrary diverting that stream takes energy.
You are proving the opposite of what you think is true.