Foreknowledge

We all should be familiar by now with the Bush administration's claim after 9/11 that we had no way of knowing that terrorists would use airplanes to attack us. That came from a multitude of high Bush administration officials.
I came across something today that is surprising. Reading in a conservative blog calling itself PatriotPostBlog.US, I found this tidbit referring to the 1993 World Trade Center bomber Ramzi Ahmed Yousef:
In 1995, after Ramzi's capture, he was being flown to New York for prosecution. As the transport helicopter passed the WTC towers, an FBI agent removed Ramzi's mask so he could see that the towers were still standing. Ramzi commented gravely, "We are not done yet." Indeed, Ramzi's computer, seized in the Philippines before his arrest in Pakistan, detailed a plan to hijack commercial aircraft and use them as flying bombs against U.S. targets—which his cadre succeeded in doing on 9/11.
Unfortunately this patriot blogger didn't give any reference for this information. It would be interesting to know more about what became of this knowledge and why the Bush administration was unaware of it even after the 9/11 attack.