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You've got the gist of it. (Although, last I checked, airplane mode shouldn't have an effect on us, but, then again, Kindles and Wi-Fi means that I never really looked too closely at this).
That said, on a PW2, the standard OTA blocker in the KUAL helper package might be enough (or not, it's been a few years since I've actively used a Kindle, better direct those sort of questions to the Kindle Dev forum).
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