Saet 62 has sparked my memory again.Not totally relevant but interesting.
Returning to Luton from Moscow one December in a BY 737,the Captain apologised for the slow progress.Apparently at the time we were encountering a head wind of 250 knots and he was unable to move out of the way as we were in Russian airspace and had to stick with the route and the flight level.
However the ride was as smooth as it can be.Not even a tremor.It did take a long time to get home though.