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Great circle and jet stream flight paths as shown on an airliner flight monitor.
Upper image is great circle flight path for San Francisco, California (SFO), USA to Beijing, China (PEK).
Lower image is Shanghai, China to SFO using a jet stream route. Although Shanghai's great circle route to SFO is east of Beijing-SFO, and there are good reasons to not overfly North Korea, a modified great circle route would still pass mostly to the east of Japan and over Russia's Kamchatka peninsula, to the left of the boundary between light blue and dark blue on the monitor
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