Forgive me if this has been discussed before, but I've heard people say there were more than 4 airliners (up to 11) due to be hijacked on 9/11, however the plans weren't carried out because of the immediate ground stop. Remember the hijackers that were caught on an Amtrak train in Texas? Supposedly this hasn't been reported because it was covered up to prevent mass hysteria and a bigger blow to the airline industry. Has anyone else heard this? What do you think?