Traffic back moving at La Guardia Airport as nationwide US grounding lifted | AFP

Air traffic is back in action at New York's La Guardia Airport as flights resume from US airports after being grounded for four hours due to a major outage on outdated communications systems. Friday's nationwide stop sparked widespread chaos and left hundreds of thousands of passengers in limbo, with some pulled off planes moments before departure by airline staff who appeared in the dark about unfolding events.

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