The planes that hit the Twin Towers on September 11, 2001, were two Boeing 767 aircraft. Specifically:
- American Airlines Flight 11, a Boeing 767-223(ER), was flown into the North Tower of the World Trade Center.
- United Airlines Flight 175, a Boeing 767-222, was flown into the South Tower.
Both were large, twin-engine, wide-body commercial jets commonly used for long-distance flights. These two planes were hijacked by terrorists and deliberately crashed into the Twin Towers, leading to their eventual collapse.