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At 8:25 AM Boston air traffic controllers heard a strange voice from Flight 11: "We have some planes. Just stay quiet, and you will be OK. We are returning to the airport."  The plane then headed south toward New York City; at 8:46 AM the plane crashed into the north tower of the World Trade Center between the 93 and 99th floors.  Sixteen minutes later, at 9:03 AM, Flight 175 crashed into the south tower - at a greater speed and more oblique angle - between the 77th and 85th floors.

At 8:25 AM Boston air traffic controllers heard a strange voice from Flight 11: "We have some planes. Just stay quiet, and you will be OK. We are returning to the airport."  The plane then headed south toward New York City; at 8:46 AM the plane crashed into the north tower of the World Trade Center between the 93 and 99th floors.  Sixteen minutes later, at 9:03 AM, Flight 175 crashed into the south tower - at a greater speed and more oblique angle - between the 77th and 85th floors.

The impact of the crashes took out any hope of getting to victims and survivors on the affected floors and the floors above; many people desperate to get away from the smoke and fire jumped to their deaths.  Both towers were designed to survive the impact of a 1960s-era jet, but the Boeing 767 was larger and carried more fuel; it was determined later that the heat from the burning fuel weakened the central steel structure and supports.  At 9:59 am the south tower collasped; the upper floors had lost support in the damaged area and fell in a chain reaction - pancake style - to the ground.  At 10:29 AM the north tower fell in a similar manner.  The death toll was around 2,750, including more than 300 firefighters and 100 police officers and other rescue workers.

The impact of the crashes took out any hope of getting to victims and survivors on the affected floors and the floors above; many people desperate to get away from the smoke and fire jumped to their deaths.  Both towers were designed to survive the impact of a 1960s-era jet, but the Boeing 767 was larger and carried more fuel; it was determined later that the heat from the burning fuel weakened the central steel structure and supports.  At 9:59 am the south tower collapsed; the upper floors had lost support in the damaged area and fell in a chain reaction - pancake style - to the ground.  At 10:29 AM the north tower fell in a similar manner.  The death toll was around 2,750, including more than 300 firefighters and 100 police officers and other rescue workers.

The building at 7 World Trade Center, commonly abbreviated as WTC7, also collapsed in the attacks not long after. This collapse is frequently cited in various [[9/11 conspiracy theories|conspiracy theories]].

The building at 7 World Trade Center, commonly abbreviated as WTC7, also collapsed in the attacks not long after. This collapse is frequently cited in various [[9/11 conspiracy theories|conspiracy theories]].