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During my visit the 9/11 memorial, a tour guide told me that the original plans for 9/11 would've also targeted attractions across both coasts of America. Naturally, I was curious and after doing a bit of research on Khalid Sheikh Mohammed's original plans for the terror attacks, I found out that he envisioned that twelve planes would be hijacked and eleven of those planes would crash into buildings across America.
If I remember correctly, the last plane would land safely and Khalid Mohammed (or some other terrorist) would deliver a speech on live television calling for people to reject the west and fight for Al-Qaeda. While the grand schematics of such a plan were certainly unfeasible (there was a reason why Osama rejected it), there might be some major repercussions had Al-Qaeda attacked a larger range of targets after gaining more resources and hijackers.