Flight 93. I suspect for most people in the United States who are old enough to remember Tuesday, September 11, 2001, they can say exactly where they were on that fateful morning. At 8:46 a.m. the twin towers were struck. The Pentagon was struck at 9:37 a.m. United Flight 93 crashed landed at 10:03 a.m. in an empty field near Shanksville, Pennsylvania.