Is this a missile, or a plane?

This exercise demonstrates that average people have no idea what a missile looks like. So the various descriptions of eye witnesses during the events of 9/11 make sense when you think about it. Why would some people say it was a small plane definitely not a commuter? Why would some say "it definitely didn't look like any plane I've ever seen before? Others said it looked more like a twin prop plane. Notice in this video just after I give the answer, the bottom of the object in question. Look similar to the bottom of the plane on 9/11?