AP Photo/Gene J. Puskar
Visitors to the memorial for United Airlines Flight 93 in Shanksville, Pa., participate in a sunrise remembrance on Sept. 11, 2006, for the 40 passengers and crew who lost their lives five years ago when the plane crashed in a field.
GETTY IMAGES/Jeff Swensen
Lesia Hatlestad, Erik Hatlestad, 13, and Dan Hatlestad of Littleton, Colo., grieve on Sept. 10, 2006, in Shanksville, Pa. The Hatlestads were there to remember their neighbor, pilot Jason Dahl, who was the captain of United Flight 93.
AP Photo/Gene J. Puskar
Here is another shot of the Hatlestad family (Dan, center; Erik, left, and Lesia) as they pause to remember their neighbor, Capt. Jason M. Dahl, at the memorial to United Flight 93 in Shanksville, Pa., Sept. 11, 2006.
AP Photo/Gene J. Puskar
Flags attached to angels in memory of the 40 passengers and crew of United Flight 93 who perished on Sept. 11, 2001, frame the field in which the plane crashed at the temporary memorial to United Flight 93 in Shanksville, Pa., Sept. 11, 2006.
AP Photo/Gene J. Puskar
Ruth Smith of Needmore, Pa., visits the temporary memorial to United Flight 93 in Shanksville, Pa., on Sept. 11, 2006. Hundreds of family members of the 40 passengers and crew aboard Flight 93 opened a solemn ceremony with prayer on Monday, five years after the doomed flight slammed into a field.
AP Photo/Gene J. Puskar
Jim Spess of Breinigsville, Pa., ties a piece of leather to the temporary memorial to United Flight 93 at sunrise in Shanksville, Pa., on Sept. 11, 2006, the fifth anniversary of the crash.
AP Photo/Gene J. Puskar
Jody Greene, 11, of Greenwich, Conn., daughter of Flight 93 passenger Donald Freeman Greene, places a teddy bear at the temporary memorial to United Flight 93 in Shanksville, Pa., on Sept. 10, 2006.
AP Photo/Keith Srakocic
President Bush and first lady Laura Bush arrive at Pittsburgh International Airport in Coraopolis, Pa., on Sept. 11, 2006. The Bushes transferred to Marine One, the presidential helicopter, to travel to Shanksville, Pa., to honor those who died in the crash of United Flight 93 in the terrorist attacks of Sept. 11, 2001.
AP Photo/Gerald Herbert
President Bush arrives to participate in a wreath-laying ceremony marking the fifth anniversary of the attacks of Sept. 11, 2001 in Shanksville, Pa., Sept. 11, 2006.
TIM SLOAN/AFP/Getty Images
President George W. Bush and first lady Laura Bush lay a wreath during a memorial service Sept. 11, 2006, at the crash site of United Flight 93, marking the fifth anniversary of the Sept. 11, 2001, terrorist attacks in Shanksville, Pa.
AP Photo/Gerald Herbert
President Bush kisses a child on the forehead as he greets family members of victims at a wreath laying ceremony in Shanksville, Pa., Monday, Sept. 11, 2006.
AP Photo/Gerald Herbert
President Bush and first lady Laura Bush participate in a wreath-laying ceremony marking the fifth anniversary of the attacks of Sept. 11 in Shanksville, Pa., Sept. 11, 2006.
AP Photo/Gerald Herbert
President Bush and first lady Laura Bush arrive to participate in a wreath-laying ceremony in Shanksville, Pa., Sept. 11, 2006 marking the fifth anniversary of the terrorist attacks of Sept. 11, 2001.
AP Photo/Gerald Herbert
President Bush hugs Rev. Paul Britton, who lost his brother, Marion Britton, at a wreath-laying ceremony marking the fifth anniversary of the attacks of Sept. 11, 2006 in Shanksville, Pa., Sept. 11, 2006.
AP Photo/Gerald Herbert
President Bush hugs family members of victims at a wreath-laying ceremony marking the fifth anniversary of the attacks of Sept. 11, 2001 in Shanksville, Pa., Sept. 11, 2006.
AP Photo/Gerald Herbert
President Bush kisses a relative of a victim during a wreath-laying ceremony marking the fifth anniversary of the attacks of Sept. 11, 2001 in Shanksville, Pa., Sept. 11, 2006.
AP Photo/Gerald Herbert
President Bush and first lady Laura Bush listen as Rev. Paul Britton, second from left, who lost his brother Marion Britton, speaks at a wreath-laying ceremony marking the fifth anniversary of the attacks of Sept. 11, 2001 in Shanksville, Pa., Sept. 11, 2006.
TIM SLOAN/AFP/Getty Images
President Bush and the first lady bow their heads in prayer during the memorial service and wreath-laying ceremony Sept. 11, 2006, in Shanksville, Pa.
TIM SLOAN/AFP/Getty Images
President Bush hugs family members of victims who died Sept. 11, 2001, 2001 on United Flight 93, after a memorial service and wreath-laying ceremony at the crash site Sept. 11, 2006, in Shanksville, Pa.
TIM SLOAN/AFP/Getty Images
President Bush and the first lady attend a memorial service and wreath-laying ceremony Sept. 11, 2006, at the crash site of United Flight 93, marking the fifth anniversary of the Sept. 11, 2001, terrorist attacks in Shanksville, Pa.