A good analogy is a 5.56 AR round. Unlike an aircraft, this round is very heavy. Now shoot that round at a 1/2" steel plate. What happens to the plate, and what happens to the lead round? The round goes splat and the plate goes ding with only a splatter pattern left on its surface. If it's soft steel, there may be a small indentation in the surface. Steel practice targets are harder steel and can be hit with numerous bullets without any damage.

The videos we have all seen, showing aircraft neatly disappearing into the side of the WTC towers is pure silliness.