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The shoes used in the failed attempt to blow up an airplane by shoe bomber Richard Reid (R) are displayed alongside an FBI model of the shoe filled with explosives, as part of a new exhibit marking the tenth annivesary of the September 11, 2001 attacks, at the Newseum in Washington, DC, as seen August 31, 2011. The exhibit, 'War on Terror: The FBI's New Focus,' illustrates the story of the FBI's changing mission after 9/11 and features more than 60 artifacts including from the first World Trade Center bombing in 1993 and pieces of the engines and landing gear of United Airlines Flight 175, which hit the South Tower of the World Trade Center. AFP PHOTO / Saul LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)
The shoes used in the failed attempt to blow up an airplane by shoe bomber Richard Reid (R) are displayed alongside an FBI model of the shoe filled with explosives, as part of a new exhibit marking the tenth annivesary of the September 11, 2001 attacks, at the Newseum in Washington, DC, as seen August 31, 2011. The exhibit, 'War on Terror: The FBI's New Focus,' illustrates the story of the FBI's changing mission after 9/11 and features more than 60 artifacts including from the first World Trade Center bombing in 1993 and pieces of the engines and landing gear of United Airlines Flight 175, which hit the South Tower of the World Trade Center. AFP PHOTO / Saul LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)

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If in fact ISIS brought down Metrojet Flight 9268 it would be a terrifying success in a long string of failures to bomb planes. CNN's Randi Kaye reports.