MSJYOP28Apilot wrote:It really depends on several factors. Jetstreams can set up in a variety of different areas. The cheapest way for this flight to go would be on one of the PACOTS, which change every day based on the winds, or an R220 routing. Going through Russia and China can sometimes be the best wind route or it can be a route to avoid volcanic activity. Sheveluch has been pretty active and this can make an R220 routing not a good idea and to be on the conservative side many carriers go farther north to avoid it. Going through Russia and China incurs a higher overflight fee cost than the routing on R220 or the PACOTS. Sometimes turbulence and storm systems can be a factor in the routing.
One thing about China, Japan and Russia is that the routings are a lot stricter than operating in US airspace. You need to stay on the airways and the airways and fixes you use are negotiated with the governments of those countries and the airlines. Some are more liberal like Japan and South Korea but others like Russia and China require certain airways and fixes. Thus if you want to go around some weather it can require a long detour.
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