Flight 77 strikes the western facade of the Pentagon at the 1st floor level just inside Wedge 1 near Corridor 4, and proceeds diagonally at an approximate 42-degree angle towards Corridor 5 in the mostly vacant and un-renovated Wedge 2.
As the nose of the plane hits the Pentagon, a huge fireball bursts upward and rises 200 feet above the roof. Multiple explosions occur as the plane smashes through the building. The front part of the relatively weak fuselage disintegrates, but the midsection and tail-end continue to move for another fraction of a second, progressively destroying segments of the building further inward. The chain of destruction results with the tail-end of the plane penetrating the greatest distance into the building.
Note: This clip includes a graphic description of John Yates’ injuries sustained on September 11, 2001. Please exercise discretion when listening.