I'm creating this thread to show people what kind of warnings our Government got prior to 9/11... Here is a good one to start. Feel free to add to it.

In late July 2001, Egyptian intelligence received a report from an undercover agent in Afghanistan that "20 al-Qaeda members had slipped into the US and four of them had received flight training on Cessnas." To the Egyptians, pilots of small planes didn't sound terribly alarming, but they passed on the message to the CIA anyway, fully expecting Washington to request information. "The request never came." [CBS, 10/9/02] Given that there were 19 hijackers and four pilots (who trained on Cessnas) in the 9/11 plot, one might think this would now be a big news item. But in fact, the information has only appeared as an aside in a CBS "60 Minutes" show about a different topic.