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The nationwide suspension of flights in the US, which led to thousands of cancellations, was caused by issues related to recently upgraded copper cables, according to Transportation Secretary Sean Duffy. He is investigating whether the problem stemmed from incompetence by the contractor or faulty equipment. The White House has ruled out a cyberattack as a cause, although an investigation is ongoing. The suspension lasted four hours, marking the longest incident of its kind in two decades. Air traffic disruptions are expected to continue for several days, as maintenance was being performed by a technology supplier on the outdated telecommunications system.