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Flights have been grounded at major US airports after a communications malfunction impacting air traffic control
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Ground stops have been ordered in New York City, Boston and Philadelphia, the Federal Aviation Administration (FAA) says
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According to US media, the issue is related to frequencies at the Philadelphia air traffic control, which handles traffic for airports in the north-east region
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Delays are spreading after scores of flights were left stranded on runways on Monday morning
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Boston Logan International Airport has warned travellers to expect disruption due to “equipment issues across the north-east”