Congressional Record: September 26, 2002 (Senate)
In September 1998, the Intelligence Community obtained information that Usama Bin Laden's next operation could involve flying an aircraft loaded with explosives into a U.S. airport and detonating it; this information was provided to senior U.S. Government officials in late 1998.
In the fall of 1998, the Intelligence Community received additional information concerning a Bin-Laden plot involving aircraft in the New York and Washington, DC, areas;
In November 1998, the Intelligence Community learned that a Bin Laden was attempting to recruit a group of five to seven young men from the United States to strike U.S. domestic targets.
In the spring of 1999, the Intelligence Community learned about a planned Bin Laden attack on a U.S. Government facility in Washington, DC.
Additionally, in 1999, the threat of an explosive-laden aircraft being used in a suicide attack against the Pentagon, CIA headquarters, or the White House, was noted in a Library of Congress report to the National Intelligence Council.
In late 1999, the Intelligence Community learned of Bin Laden's possible plans to attack targets in Washington, DC, and New York City during the New Year's Millennium celebrations.
On December 14, 1999, an individual named Ahmed Ressam was arrested as he attempted to enter the United States from Canada with detonator materials in his car. Ressam's intended target was Los Angeles International Airport. Ressam, who has links to Usama Bin Laden's terrorist network, has not been formally sentenced yet.
In March 2000, the Intelligence Community obtained information regarding the types of targets that operatives in Bin Laden's network might strike. The Statue of Liberty was specifically mentioned, as were skyscrapers, ports, and airports, and nuclear power plants;}
Senator Specter on Homeland Security and Intelligence