On that tragic day, terrorists hijacked four airplanes. Two of them were flown into the Twin Towers of the World Trade Center in New York City, causing both to collapse. Another plane crashed into the Pentagon near Washington, D.C., and the fourth, Flight 93, crashed into a field in Pennsylvania after passengers attempted to overcome the hijackers. This coordinated attack resulted in nearly 3,000 deaths and countless injuries, marking it as one of the deadliest terrorist acts in world history.