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An outage lasting about five hours in the U.S. air traffic system has caused more than 20,000 flights to be canceled or delayed since Friday. Officials suspect that a single router installed by L3Harris may have caused the problem. The investigation has not determined whether the outage resulted from user error, an installation issue, or faulty equipment, amid concerns about the aging communications system. The company said it had completed more than 70% of the shift from copper wiring to fiber-optic communications.
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