"Early on the morning of September 11, 2001, nineteen hijackers took control of four commercial airliners en route to San Francisco and Los Angeles from Boston, Newark, and Washington, D.C..[11] At 8:46 a.m., American Airlines Flight 11 was crashed into the World Trade Center's North Tower, followed by United Airlines Flight 175, which hit the South Tower at 9:03 a.m."