Top Historic Moments on Instagram: "On the 11th of September 2001, American Airlines Flight 77, a Boeing 757 hijacked by five al-Qaeda terrorists, crashed into the western side of the Pentagon in Arlington, Virginia, at 9:37 a.m. The impact and ensuing fireball killed all 64 people on board and 125 Pentagon personnel. The plane struck at ground level, penetrating three outer rings and causing partial collapse. Firefighters battled the blaze for hours amid debris and jet fuel. The attack, part of