While President Donald Trump and the first lady were in Pennsylvania observing the Sept. 11 anniversary, an equally solemn ceremony was taking place at the Pentagon more than 100 miles away.
On Sept. 11, 2001, at 9:37 a.m., American Airlines Flight 77 flew directly into the west side of the Pentagon building, killing 125 people inside. Fifty-nine passengers and crew aboard the plane, along with the five hijackers, also lost their lives.
