The problem is that the current [FAA] guidelines require each airline to test every make and model of each gizmo it wants the FAA to approve for use on its flights—and then to do the same for every type of aircraft in its fleet. The airlines have baulked at such a monumental task because of the cost. The FAA is now looking for ways to bring airlines, aircraft manufacturers, electronics makers and other interested parties together to streamline the certification process at least for tablets, e-readers, game machines and a few other popular gadgets.

But do not expect such easing to extend to phones. One reason is that, with the enormous number of makes and models in existence, getting all mobiles approved for use on board aircraft would be prohibitively expensive. Another is that the ground-based interference problem has still to be resolved.

The head of the FCC has even urged the FAA to allow more portable devices. Meanwhile, flight crews are exempt from the restrictions: