They almost missed the building.
They did not miss.
They were aiming the wing into the building to deliver the fuel load. That made fuel penetrate the building further.
Someone engineered the attack for maximum results.
They tried before, on the elevator shaft. Remember.
I will not tell you what I told my wife when she saw the first plane hit the building. In the past when I told people here some called me a liar. But I am not.