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Right, I agree. But that's about not using the device. So what difference does it make if my Kindle is in sleep mode as opposed to "completely turned off" if it's sitting in my carry-on? If it's a non-interfering device (and it is, otherwise the airline would not let me use it at all under the rule you quoted), then it's a non-interfering device whether it's sleeping or "off."
I think flight attendants say what they say because it's easily understandable. But I don't think that sleep vs. off mode is specifically required by federal law.
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