Quite apart from the obvious 'safety' aspect there are two reasons not to allow h/p to be used on planes:-
- The ringing of the infernal machines is highly irritating at the best of times. In an enclosed space (lets say a well loaded cattle class cabin) having to put up with the ringing and then the inane chatter (usualy a good few decibels above normal conversation) will be just one more added misery.
- Air rage will know new bounds as some half drunken fool decides they have to call all their mates waking up people trying to sleep 6 hours into that long haul (hell) flight.
Please let the aircraft cabin be an area of relative peace.