You follow the jetstream. So planes flying the same direction will jump in it to use the boost, while planes flying against it will fly a more off-route to avoid it. If you look at flight times for two far apart east-west cities, notice one way is usually an hour or two longer than the same flight in the opposite direction.
And here you go, it's plotting a week of minimum/average/max windspeeds at altitudes up to 30Mm (10Mm is ~30M ft), over the FWD station.
