Struck by United Airlines Flight 175 at 9:03 a.m. between floors 77 and 85.

The destruction of the World Trade Center resulted in staggering loss of life and long-term health consequences: Health Effects of the World Trade Center 9/11 Disaster

Struck by American Airlines Flight 11 at 8:46 a.m. between floors 93 and 99.

On the morning of September 11, nineteen terrorists associated with hijacked four commercial aircraft. Two of these planes were intentionally flown into the Twin Towers: