#9: September 11 Attacks (2001)
On a clear morning in the United States, four passenger planes were hijacked by terrorists. Two struck the Twin Towers in New York City, one hit the Pentagon, and another crashed into a Pennsylvania field after passengers fought back. Nearly 3,000 people were killed in the coordinated attacks.

The world changed overnight. Air travel shut down, and new security rules were created, from locked cockpit doors to the formation of the TSA. September 11 wasn’t just an aviation disaster — it was a global turning point that reshaped security, politics, and how people viewed flying forever.
