Given the technical discussions about whether a cellphone in the cockpit can interfere with the systems there in anything other than a "mild annoyance" sense, I'm not that concerned about ebooks. Or digital watches, pacemakers, electronic diaries and so on. Anything with a battery life measured in weeks is fine by me. I'm more worried that the laptop battery next to me is going to explode than that an ebook will generate enough RFI to crash the plane.
Cellphones in aeroplanes are a huge issue for cellphone networks because they move so fast and cover so many cells.
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