I hate the reporting on today's hearings into the 9/11 intellegence reporting. See this, this, or this, for examples. All of them are based on the premise that intellegence agencies failed to realize despite a few clues that a hijacked plane attack plane attack was a possibility. This is just silly, EVERYONE knew it was a "possibility," it was in a Tom Clancy novel for heaven's sake. The whole point is that its hard to sift the possibilities to find the likely ones. And there's certainly nothing in these few small clues which makes one think that this particular form of attack was any more likely than any one of a million possibilities. For every clue that these articles point out there were thousands and thousands of clues that other attacks were possible, and none of those happened.