Trump Administration Officials Remember the 184 Who Died at Pentagon in Sept. 11 Attack

Vice President Mike Pence (L) about to lay a wreath with Secretary of Defense Jim Mattis during a ceremony at the National 9/11 Pentagon Memorial to mark the 17th anniversary of the 9/11 terror attacks , in Arlington, Virginia on Sept. 11, 2018. Alex Wong/Getty Images

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.