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That restriction is for devices which *intentionally* radiate (wifi, cellphones, bluetooth etc.)
For devices which don't, or those which have a flight-safe mode which turns off their transmitters, the few minutes around take off and landing applies.
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What about ds-lite, that don't have a wi-fi off ?
That's trusting people will know how their device works, think about activating plane mode before take off (else the phone will send wi-fi / gsm waves until plane mode is activated...).
And people can't be trusted to do that...
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The point is that they cannot be *proved* to be immune
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Guess they are immune enough, or there would be more crashes.