On September 12 , 2001 , the Toyota Corolla purchased by Mihdhar was found in Dulles International Airport 's hourly parking lot . Inside the vehicle , authorities found a letter written by Mohamed Atta , a hijacker aboard American Airlines Flight 11 ; maps of Washington , D.C. and New York City ; a cashier 's check made out to a Phoenix , Arizona flight school ; four drawings of a Boeing 757 cockpit ; a box cutter ; and a page with notes and phone numbers , which contained evidence that led investigators to San Diego
American Airlines Flight 11
American Airlines Flight 11
Khalid al-Mihdhar