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How high of a risk are you willing to subject yourself and your family members to?
1 in a million? 1 in a billion?
And the issue is, there is no way to quantify the unrestricted use of any electronic device.
As to how far they transmit, I may have said this before, but with the proper equipment, you can "read" a computer from quite a distance. That is why secure computing is done on specially shielded computers that meet Tempest standards. It does not take much power to transmit a long distance.
As for a Faraday cage inside the aircraft, that would work. But at the expense of retrofitting every airplane. And the expense of carrying the extra weight (cost in reduced payload and additional fuel used). And while you are doing this retrofit, you have some planes where it is safe and some where it is not. That gets people VERY confused.
It is just that people are so selfish and self absorbed, that they cannot be bothered to be inconvenienced at ALL.
And also, everytime I have had an extended wait (beyond normal) on the ground, they have allowed cell phones and other electrronic devices. They just make you turn them off when they finally get going.
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