Final answer:
United Airlines Flight 93 crashed in Shanksville, PA at 10:03 am on September 11, 2001, after passengers confronted the hijackers. This action thwarted the terrorists' plan to target Washington, D.C., and is remembered as a profound event in U.S. history.
Step-by-step explanation:
At 10:03 am on September 11, 2001, in Shanksville, Pennsylvania, United Airlines Flight 93 crashed into a field. This was the fourth plane hijacked by al-Qaeda terrorists as part of a coordinated attack on the United States. The passengers on board, having learned about the other attacks, attempted to take control from the hijackers, which ultimately led to the crash, preventing the aircraft from reaching its intended target in Washington, D.C.
The September 11 attacks resulted in the deaths of nearly 3,000 people including passengers, crew members, and emergency responders. This tragic event has become a pivotal moment in U.S. History, symbolizing the largest terrorist attack on American soil and leading to significant changes in national security policies.