Alright more questions--Why did they said plane attacked the portion of the building that was nearly empty, And why did the aircraft undertook an extreme maneuver to strike this portion.

Where did the wings and engine go- I feel if the said plane was going at an 45 degree angle, most of the left side(wings engines) would be very noticeable, laying on the ground, surely you dont think the wings and engines completely vanish into thin air....