The planes that hit the Twin Towers of the World Trade Center on September 11, 2001, were commercial airliners:

• 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 large fuel capacity, which contributed to the extensive damage caused by the attacks