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Now i know these things (or the sony anyway) does not transmit a signal and therefore cannot effect the damn plane, the issue is how do i explain that the the highly educated flight attendants?
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Technically all electronic devices emit some EM, regardless of whether they have a radio antenna. Usually this is so low that it couldn't possibly effect the plane in any way. That said however, there is a fear that a new or malfunctioning gizmo might somehow produce noticeable interference.