On September 11, 2001, four passenger flights departed from airports in the United States between 7:59 AM and 8:42 AM. These flights would irrevocably alter the course of world history. The events unfolded rapidly, transforming the global landscape within hours. The hijackings triggered a series of devastating attacks against iconic American landmarks. This timeline details the sequence of events that unfolded on that tragic day. The attacks resulted in immense loss of life and widespread destruction. The world has not been the same since September 11, 2001.