“Five months before Sept. 11, the government warned airlines that Middle Eastern terrorists could try to hijack or blow up a U.S. plane and that carriers should ‘demonstrate a high degree of alertness.’ The warning, obtained Saturday [May 18, 2002] by the AP [Associated Press], came out after the April 6, 2001, conviction of Ahmed Ressam in connection with a failed plot to blow up Los Angeles International Airport during the millennium celebrations.”
– Associated Press Staff, “Airlines Warned of Non-Specific Terrorist Threats,” Associated Press, May 18, 2002