Same, although I just have the one old Kindle that I revived with a new battery. It's never had a network connection since I factory reset it. I just dump ebooks onto it via USB. It might be recording all sorts of analytics but I don't care because it'll never be connected to the outside world.

Plus, for all the people saying basically "it's for your own good", the battery lasts much longer on aeroplane mode. For this device, for me, WiFi is an anti-feature.