PITTSBURGH — Former first lady Laura Bush will speak at an event marking the ninth anniversary of the crash of Flight 93 during the Sept. 11 terror attacks, the National Park Foundation announced Friday.

Bush, who is former honorary chair of the foundation, has been to the site before and family members of the 40 passengers and crew who died there said they are pleased to welcome her back.

Flight 93 was traveling from Newark, N.J., to San Francisco when hijackers took it over on Sept. 11, 2001. It crashed in a field near Shanksville killing everyone aboard.