US air safety officials say they will investigate why a Boeing 777 jet unexpectedly lost altitude and nearly plunged into the Pacific Ocean.
Reports say United Airlines flight 1722 had left Maui on December 18 and was climbing when it suddenly plummeted 1,400ft (425m).
The flight was going normally until 71 seconds after take-off from Kahului Airport when it suddenly dropped in elevation, according to Flightradar24, an aviation website.
The National Transportation Safety Board (NTSB), which investigates US plane crashes, will produce a report about the incident within three weeks.
Its adds to a number of near misses involving planes this year.