On September 11, 2001, four commercial planes were hijacked by terrorists. American Airlines Flight 11 and United Airlines Flight 175 crashed into the North and South Towers of the World Trade Center, respectively. American Airlines Flight 77 crashed into the Pentagon. United Airlines Flight 93 crashed in a field in Pennsylvania after passengers attempted to retake control of the plane. In total, nearly 3,000 people were killed during the 9/11 terrorist attacks. The document provides details on the flights, locations where the planes crashed, and number of victims from each location.