Air traffic controllers monitoring all current flights determine that American Airlines Flight 11, a Boeing 767 from Boston's Logan International Airport has taken a turn toward New York City. Shortly after, Flight 11 crashes into the North Tower of the World Trade Center, although the air traffic controllers do not immediately realize what has happened. About 20 minutes earlier, a tape recording was made of Mohamed Atta's line "We have some planes, just stay quiet and you'll be okay. We are returning to the airport."