Clear air turbulence is why you should always keep your seat belt fastened when seated.

This is the best summary I could come up with:

The airline said the Boeing 777 carrying 211 passengers – mostly from Australia, Britain, New Zealand or Singapore – and 18 crew members encountered severe turbulence on its way from Heathrow.

At a press conference, Kittipong Kittikachorn, the general manager of Airports of Thailand confirmed that one person had died and that seven were in a critical condition, mostly with head injuries.

In a statement, the airline said: “Flight SQ321 encountered sudden extreme turbulence over the Irrawaddy basin … The pilot declared a medical emergency and diverted the aircraft to Bangkok.

Another passenger, named only as Andrew from London, told BBC Radio 5 Live: “During the few seconds of the plane dropping there was an awful screaming and what sounded like a thud.”

Passengers were being kept in a special part of Suvarnabhumi airport and given dinner, before a new Thai Airways flight carrying on those able to travel was expected to take off for Singapore later on Tuesday evening.

Two crew onboard a British Airways flight returning from Singapore to London in June 2023 sustained broken legs after being thrown around the cabin during severe turbulence over the Bay of Bengal.

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This is why you fasten your seatbelt when that light comes on.