Of course, it will be argued that the probability of all the ingredients for interference coming together is highly unlikely. However, with the explosive growth of PEDs and airline passengers, millions of PEDs are flying every day. We also should not exclude modified and damaged PEDs also. Finally there may be the possibility of deliberate jamming. Most of the interest and concern in the media as well as other venues has centered on large air transport aircraft.
Large aircraft are the least likely to experience interference from PEDs carried aboard.
Smaller aircraft are much more vulnerable for a number or reasons. First, they are smaller and the distance separating the radiator, the PED, and the receptor, the navigation antenna, is much shorter. They are more likely to be made of composites and afford less shielding. The cabin crew, if there is one, is likely to be smaller and policing the use of PEDs will be more difficult. Finally, because smaller aircraft make shorter trips, they spend more of their flight time making approaches and landings.