Like most rules that seem to make sense on first inspection, the real problem is with enforcement. It’ll be almost impossible (and most certainly more time consuming) for aircrew to differentiate between a passenger reading an eBook or surfing the net, or if their iPhone/iPad is actually in airplane mode. That means that “for your safety”, aka “ease of enforcement and winning of arguments”, airlines will still use their existing blanket policy of “turn it off” rather than try and deal with any complexities of enforcement these new findings will bring.
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