CNN The Situation Room December 12, 2014 23:53:00
Done. the ripple effect felt at airports across the u.k. heathrow saying the flight disruptions could continue to saturday. delays also in paris. u.s. carriers also experiencing some delays. the question now, what caused the system failure? officials have ruled out a hack and aviation security analysts agree. >> we certainly have no record of anyone being hacked into with the air traffic control system in the united states or europe. i don't believe that a hack is what caused this problem. >> there are back-up systems but as we saw in chicago this september, when wires were cut and a fire igni...
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