Editor’s Note: Mapping the travel geography of terrorist networks can help expose how they operate internationally. Olivier Walther, Joseph Padron, and Jason Scheuer of the University of Florida and Rafael Prieto Curiel of the Complexity Science Hub in Vienna take a close look at the 9/11 plot and find that terrorists who belonged to the same operational cell did not necessarily live in the same place at the same time. However, their itineraries closely matched their organizational structure. Distinct travel patterns and strong social ties not only made the 9/11 travel network resilient but also essentially allowed the 19 hijackers to hide in plain sight while being very mobile.
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On June 3, 2000, Mohamed Atta, the ringleader of the Sept. 11 attacks, cleared Immigration and Customs at Newark Liberty International Airport after arriving from Prague, Czech Republic. Over the course of the next year and a half, Atta and 18 other terrorists embarked on a series of trips within the United States, from
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