Or they saw holograms or in a state of shock believed what everyone else said they saw.  It's not that hard to convince a frightened crowd. Especially with a tv movie from a few months earlier with planes hitting the tower. Also in movies and t.v. Images from different cameras same spot: https://youtu.be/SpK8yGyEefg Decorated top pilot John Lear said it's not possible that poorly trained novices flew planes of that size and make perfect center to hit the building. The images also are wrong shape and have some odd attachments under that they shouldn't. Last but not least he says at that low altitude the plane would be unmanageable and falling apart at that speed. Then there are the inconsistencies noticed by an experienced flight attendant who ended up writing a book on everything she found. https://youtu.be/7md2QzNsAe4