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Neat indeed; you seem to have discovered lots of interesting tidbits.

Of all you mention, two are extremely surprising to me, and I'm not even sure which is more - China course corrections and GPS jamming. The former sounds straight out of Cold War counterespionage playbook. In this day and age, why would they bother? The latter... again, are drones really that big of an issue to justify the jammers (and, presumably, legal clearance for jamming GPS)?

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I'm not sure that it's fair to infer that China's course corrections are to avoid espionage. Google Maps satellite view will show you far more, for far less money. And military areas are of far more concern for espionage than cities.

I suspect the reroutes are more for noise reasons, though I am not certain.

Most Chinese airspace is managed by the Chinese military, and military flights take priority. So that may be a reason why as well. https://www.economist.com/graphic-detail/2017/10/30/why-chin...

Could it be concerns about planes crashing into populated areas?

That is so rare you don't really plan for it.

> The latter... again, are drones really that big of an issue to justify the jammers (and, presumably, legal clearance for jamming GPS)?

If birds are that big of an issue, would drones not be, too? https://en.wikipedia.org/wiki/Bird_strike

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