Tip: if you let kids and others in your home use a Kindle and they might unintentionally turn off the airplane mode ...

Go to your router settings and blacklist the Kindle's mac id.

Sleep peacefully that your kindle will never be bricked or wiped by a software update.

One benefit of jailbreaking - https://kindlemodding.org/jailbreaking/post-jailbreak/disabl...

Yeah mines been on airplane mode for probably a decade now, really not seeing a reason to ever connect it to the internet