The Boeing 777 dropped more than 1,400 feet before climbing again, according to data from tracking service Flightradar24. The plane then continued on to San Francisco. No injuries were reported.
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A United Airlines jetliner taxis to a runway for take off from Denver International Airport, on Dec. 27, 2022.
A spokesman for the National Transportation Safety Board said Monday that the investigative agency is still seeking information about the Dec. 18 incident, which only recently came to public attention after a report in The Air Current, an aviation-industry publication.
The Federal Aviation Administration, which oversees airlines, said the United crew reported the incident under a voluntary safety-reporting program. The FAA said it reviewed the incident "and took appropriate action" without providing further details.
United said it worked with the FAA and the pilots' union on an investigation that led to additional training for the two pilots, which is still going on. The airline did not explain why the pilots chose to continue the long, overwater flight to San Francisco instead of returning to Kahului Airport on the island of Maui.