A British Airways Boeing 787-9, registration G-ZBKG performing flight BA-49 from London Heathrow,EN (UK) to Seattle,WA (USA), was enroute at FL380 about 120nm north Iqaluit,NU (Canada) when the aircraft encountered severe clear air turbulence. The crew descended the aircraft to FL340, the turbulence ceased after the aircraft had descended below FL360. One flight attendant received minor injuries, medical advice was obtained before the crew decided to continue to destination for a landing without further incident about 4:15 hours after leaving FL380.

The Canadian TSB reported paramedics assessed the flight attendant at the gate, the aircraft received no apparent damage.

https://flightaware.com/live/flight/BAW49/history/20210207/1430Z/EGLL/KSEA