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As an airline pilot I can attest to radio interference from cell phones. Often I hear static on the communications radios right after we land and everyone onboard starts turning their phones on. Cell phones often are transmitting at high power when they are initially finding towers. As for the other electronics that have no transmitters it boils down to the shear number of devices that would need to be tested on every different model of aircraft. Any device that uses electricity has the potential to cause electromagnetic interference wether it has a transmitter or not. Aviation will always be a place where we must take a very conservative stance with these issues.
Posted by yeti80829