Never-before-seen photos obtained by NBC News show American Airlines Flight 77 hitting the Pentagon on Sept. 11. NBC’s Jim Miklaszewski explains that the sequence of five photos, taken from a Department of Defense security camera, shows the Boeing 757 hitting the ground an instant before it plows into the building and explodes in a deadly fireball. The crash left 189 people dead, including 59 victims and five hijackers who were aboard the aircraft. Full Story