On September 11, 2001, four commercial passenger jets were hijacked and crashed in coordinated terrorist attacks. The types of planes involved were:

• American Airlines Flight 11: Boeing 767-223ER
  • Crashed into the North Tower of the World Trade Center

• United Airlines Flight 175: Boeing 767-222
  • Crashed into the South Tower of the World Trade Center

• American Airlines Flight 77: Boeing 757-223
  • Crashed into the Pentagon

• United Airlines Flight 93: Boeing 757-222
  • Crashed into a field near Shanksville, Pennsylvania, after passengers attempted to retake control from the hijackers

In summary, the hijacked planes were two Boeing 767s (Flights 11 and 175) and two Boeing 757s (Flights 77 and 93)