On August 10, 2001, potential terrorist Zacarias Moussaoui left Oklahoma for Minnesota, where he began flight simulator training at Pan Am. “His conduct, however, raised the suspicions of his flight instructor. It was unusual for a student with so little training to be learning to fly large jets without any intention of obtaining a pilot’s license or other goal. On August 16 [2001], once the instructor reported his suspicion to the authorities, [Zacarias] Moussaoui was arrested by the INS [Immigration and Naturalization Services] on immigration charges.”
– 9/11 Commission, The 9/11 Commission Report, Page 247