David Filipov looks for a picture of his father, Al Filipov, at the Tribute WTC Visitor Center in New York City. The center is run by the September 11th Families Association as a museum and memorial to the victims and history of the World Trade Center and the 9/11/2001 attacks. Filipov's father was on American Airlines Flight 11, the first plane flown into the towers
The Falling Man. A man, whose identity remains unknown, falls headfirst after jumping from the north tower of New York's World Trade Center after it was atacked on Tuesday, Sept. 11, 2001. This now-famous photograph has become iconic, and inspired an article in Esquire magazine, and a later documentary movie. (AP Photo/Richard Drew)
The south tower of New York's World Trade Center collapses Tuesday, Sept. 11, 2001. (AP Photo/Richard Drew)
An aerial view on September 17th, 2001 shows only a small portion of the scene where the World Trade Center collapsed following the Sept. 11 terrorist attack. Surrounding buildings were heavily damaged by the debris and massive force of the falling twin towers. (U.S. Navy photo by Chief Photographer's Mate Eric J. Tilford)
An aerial view of the recovery operation underway in lower Manhattan at the site of the collapsed World Trade Center on October 4, 2001. (Andrea Booher/ FEMA News Photo)
A street scene in lower Manhattan near the site of the terrorist attack on the World Trade Center in New York on Tuesday, Sept. 11, 2001. (AP Photo/Richard Drew)
Firemen continue to fight the fires that sprout up from within the rubble of the World Trade Center in this September 19, 2001 file photo. (REUTERS/PA2 Tom Sperduto/US Coast Guard)
Sunlight filters into the still-smoldering site of the World Trade Center attack highlighting the remains of Tower Two as workers riding in a basket suspended from a giant crane hover above, Saturday, Oct. 27, 2001, in New York. (AP Photo/William C. Lopez)
Firefighters make their way over the ruins of the World Trade Center through clouds of smoke as work continues at ground zero Thursday, Oct. 11, 2001, in New York, one month after the terrorist attacks on the Trade Center. (AP Photo/Stan Honda)
The sun streams through the dust over the wreckage of the World Trade Center on September 15, 2001. (Andrea Booher/FEMA News Photo)
Exhibit #P200336 from the United States v. Zacarias Moussaoui Criminal trial No. 01-455-A - A collage of photographs of almost 3,000 victims, nearly all of those who were killed during the terrorist attacks on September 11, 2001 (missing are 92 of the victims and all of the terrorists). (USDOJ)
The "Tribute in Light" is seen near the World Trade Center site on September 10, 2009 in New York City. (Mario Tama/Getty Images)
Drops of rain fall through the "Tribute in Light" near the World Trade Center site on September 10, 2009 in New York City. (Mario Tama/Getty Images)
An airfone recovered from the wreckage of Flight 93, left, and a Pentagon ID from Patrick Dunn are seen at an exhibit at the Smithsonian containing artifacts from the 9/11 attacks, Wednesday, Sept. 9, 2009 in Washington, D.C. (AP Photo/Evan Vucci)
Albany, N.Y., firefighter Brian Rhatigan of Albany's Engine 9 looks at the permanent exhibit of artifacts from the World Trade Center attack which includes New York City's fire department's Engine 6, background, on Wednesday, Sept. 4, 2002, at the New York State Museum in Albany, N.Y. (AP Photo/Jim McKnight)
The mangled TV antenna from the World Trade Center anchors the 9/11 exhibit with a wall of that days front pages from around the world at the new Newseum building on April 1, 2008 in Washington, D.C. (TIM SLOAN/AFP/Getty Images)
The World Trade Center site, lower center, and New York's financial district are shown in this aerial photo taken on March 22, 2009. (AP Photo/Mark Lennihan)
Construction of One World Trade Center, previously called the Freedom Tower, continues on September 8, 2009 in New York City. (Rick Gershon/Getty Images)
A PATH commuter train enters the World Trade Center site in New York, U.S., on Tuesday, Sept. 8, 2009. (Daniel Acker/Bloomberg)
In this U.S. Navy file photo of May 28, 2002, cleanup and recovery workers carefully lower a steel beam, the "Last Column" - the final piece of debris to be removed from Ground Zero in a ceremony at the World Trade Center disaster site in New York. (AP Photo/ U.S. Navy, Photographers Mate 2nd Class Bob Houlihan)
Workers and officials watch as the historic "Last Column," (covered in white) site is returned on August 24, 2009 for permanent installation in the 9/11 Memorial Museum at the WTC site in New York. The 36-foot high "Last Column" was covered in tributes from workers, rescue personnel and family members before the column was removed from the site, marking the end of the recovery efforts in May 2002. (STAN HONDA/AFP/Getty Images)
In this photo taken Sept. 2, 2009, ironworkers use torches to cut steel at 1 World Trade Center in New York. The tower, formerly known as the Freedom Tower, will rise to a height of 1,776 feet (541 meters). (AP Photo/Mark Lennihan)
The World Trade Center construction site is shown as it appeared this morning, Friday, Sept. 11, 2009 in New York. (AP Photo/Mark Lennihan)
A young woman's picture is surrounded by umbrellas as friends and relatives of the victims of the Sept. 11, 2001 attacks gather for a commemoration ceremony at Zuccotti Park, adjacent to ground zero, on the eighth anniversary of the terrorist attacks on the World Trade Center, Friday, Sept. 11, 2009 in New York. (AP Photo/Jason DeCrow)
Frances Watson holds a picture of her niece CeeCee Coss Lyles, who was a flight attendant of United Airlines Flight 93, in front of a plaque unveiled by US House Speaker Nancy Pelosi and Senate Majority Leader Harry Reid dedicated to Flight 93, at the East Front Lobby of the Capitol Hill in Washington, DC, on September 9, 2009. (JEWEL SAMAD/AFP/Getty Images)
Tom Cody, a policeman from Chicago plays bagpipes in tribute to the passengers and crew of United Flight 93 at the Flight 93 Temporary Memorial outside Shanksville, Pennsylvania, September 10, 2009. (REUTERS/ Jason Cohn)
A woman looks at items left at the Flight 93 Temporary Memorial outside Shanksville, Pennsylvania, September 10, 2009. (REUTERS/Jason Cohn)
The Pentagon Memorial illuminated at night, photographed in Arlington, Virginia on Wednesday, Sept. 24, 2008. (Globe Photo/Wiqan Ang)
A family member of a victim of the 9/11 attack walks through the Pentagon Memorial before a rememberance ceremony September 11, 2009 in Arlington, Virginia. U.S. President Barack Obama joined staff and family members at the Pentagon to comemorate the eighth anniversary of the September 11 attacks. (Mark Wilson/Getty Images)
A woman takes a photo of a plaque that honors the victims of Flight 93 that was unveiled at the U.S. Capitol Wednesday, Sept. 9, 2009, in Washington, D.C. (AP Photo/Evan Vucci)
Sarah Wainio shows the name of her sister Honor, who was killed on Flight 93, tattooed to her wrist, Wednesday, Sept. 9, 2009 in Washington, D.C. (AP Photo/Evan Vucci)
Family members of victims pay their respects at the site of the former twin towers on the eighth anniversary of the attacks on the World Trade Center, in New York, September 11, 2009. (REUTERS/Gary Hershorn)
Family members of September 11th attack victims pay their respects on September 11, 2009 at the Ground Zero reflecting pool during the 8th anniversary commemoration ceremony. (CHANG W. LEE/AFP/Getty Images)
U.S. soldiers from Combined Security Transition Command Afghanistan pay their respect during 9/11 remembrance ceremony at Camp Eggers in Kabul, Afghanistan, at sunset Friday, Sept. 11, 2009. (AP Photo/Manish Swarup)
Flowers float in the reflecting pool after family members of victims placed them as they gathered at Ground Zero during a 9/11 memorial ceremony on September 11, 2009 in New York City. (Chang W. Lee/Getty Images)
Flowers now fill the reflecting pool during the eighth anniversary remembrance of the attacks on New York and Washington, in New York September 11, 2009. (REUTERS/Chip East)
Roses thrown by mourners float in a reflecting pool at the World Trade Center site in New York during a ceremony to commemorate the eighth anniversary of the Sept 11 terrorist attacks Friday, Sept. 11, in New York. (AP / Chang W. Lee)
People file past the reflecting pool in ground zero during the the eighth anniversary commemoration ceremony of the Sept. 11, 2001 World Trade Center attack, in New York, Friday Sept. 11. (AP / Chip East)
A woman holds a photograph as friends and relatives of the victims of the Sept. 11, 2001 attacks gather for a commemoration ceremony at Zuccotti Park, adjacent to ground zero, on the eighth anniversary of the terrorist attacks on the World Trade Center, Friday, Sept. 11, in New York. (AP / Jason DeCrow)
Mourners pay their respects during a ceremony at the World Trade Center to commemorate the eighth anniversary of the Sept. 11 terrorist attacks Friday, Sept. 11, in New York. (AP / Peter Foley)
A young girl, left, drops flowers into a reflecting pool during a memorial ceremony at the World Trade Center construction site on the eighth anniversary of the terrorist attacks, Friday, Sept. 11, in New York. (AP / Mark Lennihan)
Mourners of Sept. 11 victims place flowers in the reflecting pool at ground zero during the the eighth anniversary commemoration ceremony, in New York, Friday Sept. 11. (AP / Peter Foley)
Mourners of Sept. 11 victims place flowers in the reflecting pool at ground zero during the the eighth anniversary commemoration ceremony, in New York, Friday Sept. 11. (AP / Peter Foley)
People leave after paying their respects at Ground Zero during a 9/ 11 memorial ceremony on Sept. 11, in New York City. (Getty Images / Seth Wenig)
People look at the World Trade Center construction site, Friday, Sept. 11, in New York. (AP / Mary Altaffer)
President Barack Obama wipes rain drops from his face as he greets family members of victims of the Sept. 11 attacks after speaking at the Pentagon Memorial, marking the eighth anniversary of the attacks, Friday, Sept. 11, at the Pentagon. (AP / Charles Dharapak)
Regan Howell of Arkansas holds an umbrella for his sons Ashton, 8, and Alec, 12. They were the first family members of victims of the 2001 Pentagon terror attack to arrive for a rain-soaked ceremony honoring those who perished when a passenger jet flew into the headquarters of America's military, Friday, Sept. 11. Howell is the brother of Brady Kay Howell, a Navy employee who died at age 26 in the attack. He was a native of Idaho. (AP / J. Scott Applewhite)
Visitors to the temporary Flight 93 memorial participate in a sunset ceremony of opening a large commemorative flag, Thursday, Sept. 10, in Shanksville, Penna. United Flight 93 crashed in Shanksville on Sept. 11, 2001, after passengers and crew diverted the hijacked airplane from its intended target Washington, D.C. (AP / Carolyn Kaster)
A U.S. soldier salutes during a ceremony to mark the anniversary of Sept. 11 2001, at the main U.S. base, in Bagram, north of Kabul, Afghanistan, Friday, Sept. 11. (AP / Musadeq Sadeq)
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