Fear. Put your cellphone near your FM radio. Listen in amazement as the digital chatter between your phone and some remote tower causes interference in your ra

Fear. Put your cellphone near your FM radio. Listen in amazement as the digital chatter between your phone and some remote tower causes interference in your radio reception and affects your listening pleasure. Now imagine that same thing happening to the digital signals in the airplane's electronics while attempting to operate the craft. Catastrophe, chaos, etc. ad nauseum. Realistic? Doubtful for many reasons. But that's the fear the bureaucrats, pilots, and passengers possess.