The planes that crashed into the Twin Towers of the World Trade Center on September 11, 2001, were commercial airliners hijacked by terrorists. Specifically:
- American Airlines Flight 11, a Boeing 767-223(ER), crashed into the North Tower.
- United Airlines Flight 175, a Boeing 767-222, crashed into the South Tower.
Both were large Boeing 767 aircraft chosen for their long-range and fuel capacity, which made them suitable for the hijackers' plans
