A Singapore Airlines flight hit turbulence over the Indian Ocean and descended around 1800 metres in about three minutes, the carrier said overnight. A British man died and authorities said dozens of passengers were injured, some severely.
An airport official said the 73-year-old man may have had a heart attack, although that hasn't been confirmed. There were also 23 New Zealanders on the plane, the airline confirmed.
The Boeing 777 flight from London's Heathrow airport to Singapore, with 211 passengers and 18 crew members aboard, was diverted and landed in stormy weather in Bangkok.
The airline confirmed the event occurred as a result of "severe" turbulence. So, what is that?
According to the US Federal Aviation Administration (FAA), turbulence is air movement created by atmospheric pressure, jet streams, air around mountains, cold or warm weather fronts or thunderstorms.
"It can be unexpected and can happen when the sky appears to be clear. Turbulence can give an airplane a sudden jolt that can injure passengers and flight crewmembers who aren't buckled in."
In the case of Singapore flight SQ321, FlightRadar24 noted there were thunderstorms, some severe, in the area at the time.
The FAA says there are a number of things passengers can do to avoid injury if turbulence occurs on their flight.
They say listening to safety briefings before an aircraft takes off and adhering to the airlines carry-on restrictions are effective ways to prevent injury.
One of the best ways to avoid injury during turbulence is to be buckled into your seat. Airbus recommended that passengers are aware of this and are encouraged to keep their seatbelt fastened at all times.
Turbulence can also cause a lot of anxiety for passengers, even before they board the plane.
Air New Zealand recommends telling someone you're travelling with, such as a crew member or loved one, that you're an anxious flyer.
The airline recommends passengers work through discomfort by focusing on why you're flying in the first place.
"Tune in to our inflight audio on international flights – there are even a few guided meditations which may help keep you calm (look for Stars of Aroha)."
Air New Zealand says if you encounter turbulence, remind yourself it's uncomfortable but it's safe.
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