Visitors walk through the fields before a luminaria service at the Flight 93 National Memorial on September 10, 2016 in Shanksville, Pennsylvania....
Undated photos of suspected hijackers of United Airlines flight that crashed in rural Pennsylvania, released by the FBI September 27, 2001 in...
Visitors to the temporary memorial overlooking the crash site of Flight 93 fold and unfold a large flag honoring the victims of Flight 93 that lost...
Superman action figure left under the name of passenger Lewis J. Nacke II at the Flight 93 National Memorial on the 16th Anniversary ceremony of the...
Flag is unfolded at a memorial site on the 5th anniversary of the September 11, 2001 attacks, where United Flight 93 crashed into a field in...
Over 25,000 items of memorabilia sit along the fence at the Flight 93 Memorial site August 24, 2006 in Shanksville, Pennsylvania. The memorial site...
Visitor traces the date etched in a marble slab on the Wall of Names at the Flight 93 National Memorial before the 15th Anniversary of the September...
Pennsylvania National Guard Private Edward Noon takes a knee to say a prayer during a luminaria service at the Flight 93 National Memorial on...
Shanksville fireman's coat joins the flags, caps, helmets and other gifts as part of the temporary memorial at the Flight 93 crash site September 11,...
Temporary memorial of U.S. Flags and a cross is shown near the crash scene of Flight 93 August 25, 2002 in Shanksville, Pennsylvania. According to...
Family members walk to the rock marking the impact site after listening to President Donald Trump deliver a speech at the Flight 93 National Memorial...
Visitors stroll through the Flight 93 National Memorial in Shanksville, Pennsylvania on August 19, 2016. American Airlines Flight 93 crashed into a...
Gene Stilp, designer of the Flight 93 Flag, adjusts his flags that are part of the temporary memorial overlooking the crash site honoring the victims...
Visitor walks along the Wall of Names during the ceremony marking the 10th anniversary of the crash of United Flight 93 at the Flight 93 National...
First Lady Jill Biden embraces flight attendants during a ceremony commemorating the 21st anniversary of the crash of Flight 93 during the September...
First lady Jill Biden stands with flight attendants remembering their fallen co-workers victims during a ceremony commemorating the 21st anniversary...
Alice Hoglan, Lyz Glick, Deena Burnett, and Lisa Beamer accept ESPY's Arthur Ashe Courage Award on behalf of Mark Bingham, Jeremy Glick, Tom Burnett,...
In this handout photo provided by the FBI, Undated photos of suspected hijackers of American Airlines flight, United Airlines flight , American...
Scott and Walter Neilly, brothers, from Bradford, Pa look over the crash site of Flight 93 following the announcement that Osama Bin Laden had been...
Former Secretary of State Colin Powell and Secretary of the Interior Ken Salazar, Gordon Felt and General Tommy Franks bow their heads in a moment of...
House Speaker Nancy Pelosi helps unveil a plaque dedicated to those lost on United Airlines Flight 93 during a Congressional plaque dedication.on...
Vice President Mike Pence and his wife, Karen, tour the Flight 93 National Memorial on the 16th Anniversary ceremony of the September 11th terrorist...
Vice President Mike Pence and his wife, Karen, tour the Flight 93 National Memorial on the 16th Anniversary ceremony of the September 11th terrorist...
Visitors gather to pay respects during the Flight 93 National MemorialÕs annual Luminaria on the eve of 16th Anniversary ceremony of the September...
Nancy Root reads a letter placed on a memorial to Lorraine Bay before a memorial comemorating the victims of Flight 93, that crashed during the 911...
Pennsylvania Governor Ed Rendell sits in the audience with other dignitaries before speaking at a memorial site on the 5th anniversary of the...
American flags fly at a memorial site on the 5th anniversary of the September 11, 2001 attacks, where United Flight 93 crashed into a field in...
Senator Rick Santorum collects his thoughts before speaking at a memorial site on the 5th anniversary of the September 11, 2001 attacks, where United...
Bell ringers mark the names of the 40 victims of United Flight 93 on the 5th anniversary of the September 11, 2001 attacks, where United Flight 93...
Visitors attend a Flight 93 Memorial site August 24, 2006 in Shanksville, Pennsylvania. The memorial is situated near the Flight 93 crash site and...
Visitor attends a Flight 93 Memorial site August 24, 2006 in Shanksville, Pennsylvania. The memorial is situated near the Flight 93 crash site and...
Visitor of the Flight 93 Memorial Chapel views biographies of the forty victims of the Flight 93 August 24, 2006 in the outskirts of Shanksville,...
Vaughn Hoglan stands with his sister Alice Hoglan, as she speaks about her son Mark Bingham, who died on United Airlines Flight 93, when it crashed...
Solitary visitor views the September 11, 2016 sunrise from the flight path overlook at the Flight 93 National Memorial before the 15th Anniversary of...
National Park Service ranger waits before the start of a luminaria service at the Flight 93 National Memorial on September 10, 2016 in Shanksville,...
Kiki Homer of New York City and her niece Tiffany Giardana look closely at a scale model of the Flight 93 National Memorial after a news conference...