The U.S. air traffic control system is vulnerable to hacking by terrorists, according to a report from the Department of Transportation. "In our opinion, unless effective action is taken quickly, it is likely to be a matter of when, not if, ATC systems encounter attacks that do serious harm to ATC operations," the report said. Hackers already have accessed FAA computers on at least two occasions, though the agency insists those servers are separate from the air traffic system. "It's not possible to use the administrative and mission support network to access the air traffic control network," a spokeswoman says.
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