2. In early 1995, Abdul Hakim Murad--Ramzi Yousef’s accomplice in the Manila airlines bombing plot--told Philippine authorities that he and Yousef had discussed flying a plane into CIA headquarters” (345). It was, we saw, this plan that provided the basis for Wolfowitz’s “failure of imagination” comment.
Page 264
The 9/11 Commission Report: Omissions and Distortions
David Ray Griffin

As we’ve seen already, General Myers told the 9/11 Commission that he was aware of this plot (Google Bojinka for more). Their case isn’t that they’d never heard of the suggestion of a plane being used as a weapon, more that the intelligence pointed to other forms of attack as more likely.

In any event, this story doesn’t fully satisfy Dr Griffin’s requirement for contradicting NORAD. it certainly included suicide pilots, but wasn’t necessarily about hijacking, or using commercial airliners as missiles (the airliners in the first phase were to be blown up):

...the Bojinka operation called for a second, perhaps even more ambitious phase, as interrogators discovered when they pressed Murad about his pilot's licence. All those years in flight school, he confessed, had been in preparation for a suicide mission. He was to buy, rent, or steal a small plane, fill it with explosives and crash it into CIA headquarters.

There were secondary targets the terrorists wanted hit: U.S. Congress, the White House, the Pentagon and possibly some skyscrapers. The only problem, Murad complained, was that they needed more trained pilots to carry out the plot.
http://www.freerepublic.com/focus/news/600300/posts

Go read the full article for more people saying “yes, after this we should have known”, “no, it doesn’t mean we should”, “it was a failure of imagination” and more.