Flights in Phoenix had been stopped as part of a nationwide ground stop ordered by the Federal Aviation Administration.
The Canadian Press on MSN
The latest: FAA lifts nationwide ground stop on flights that halted travel across the US
The Federal Aviation Administration says airplane departures can resume after the agency lifted a nationwide ground stop caused by communications problems.
All commercial flights were grounded for more than four hours, throwing the air travel system in the U.S. into chaos.
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