And also that the building is too short for there to actually be a plane-shaped indentation, if the plane goes in from the side it's just gonna smash a giant hole through the wall and be completely disintegrated, and if it goes in through the top it just destroys the roof and disintegrates. The planes that went through the twin towers actually did make *vaguely* plane-shaped holes disturbingly enough, but that's only because the building itself was tall enough and secure enough to withstand it. The pentagon wasn't designed with a plane crash in mind, nor is it tall enough.