Updated at 2 p.m. ET
A $26 million visitor complex honoring the victims of Flight 93 was dedicated and opened to the public on Thursday. The United Airlines plane was one of four hijacked by al-Qaida on Sept. 11, 2001, and the only flight that didn't reach its target.
Passengers forced the terrorists in control of the plane to deliberately crash it in rural Pennsylvania. Forty crew and passengers were killed, along with the four hijackers.
Their presumed target was the U.S. Capitol.