"Report of an Unidentified Aerial Phenomenon and its Safety Implications at O'Hare International Airport on November 7, 2006" (PDF).
בדיקה אחרונה ב-23 ביוני 2007.  "Report of an Unidentified Aerial Phenomenon and its Safety Implications at O'Hare International Airport on November 7, 2006" (PDF).