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Why a problem on the ground can affect flights thousands of miles away among other issues – WTOP News
Officials said intermittent frequency instability hit as many as 17 regional air traffic control centers, forcing a nationwide ground stop before service resumed.
Regional U.S. air traffic control centers communicate using a complex network that’s “one of the largest telecommunications systems in the country,” and disruptions like those seen on Friday with an hourslong, nationwide grounding of flights can reverberate widely, according to an aviation expert. Michael McCormick, a former airspace manager with the Federal Aviation Administration, said...