United Airlines did not immediately respond to a Reuters request for comment.
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The grounding will be in place until 0700 GMT, the regulator said in a status update.
This comes roughly a month after a glitch forced United Airlines to ground flights across major U.S. airports including Newark, Denver, Houston and Chicago, causing widespread delays throughout its network in August. The outage was resolved within a few hours.
Reporting by Shivani Tanna in Bengaluru; Editing by Janane Venkatraman
US FAA issues ground stop for United Airlines flights due to tech issue
