At 8:46 a.m. ( EDT ) on September 11 , 2001 , five hijackers affiliated with al-Qaeda crashed American Airlines Flight 11 into the northern facade of the North Tower between the 93rd and 99th floors . Seventeen minutes later , at 9:03 a.m. ( EDT ) , a second group of terrorists crashed the hijacked United Airlines Flight 175 into the southern facade of the South Tower , striking between the 77th and 85th floors
United Airlines Flight 175
United Airlines Flight 175
One World Trade Center