If you fly long haul over once a month (which I guess a number of people on here do) with the same carrier you invariably get months when on the first trip you see every movie you want to out of the selection available, and then on the next trip you are stuck again with same selection.
Yes, well, that's why god (or at least Apple) invented the iPad.
Those of us who travel regularly no doubt already have a laptop in the bag, so adding 1 x iPad and 1 x Charger cable (which is the same for an iPhone) is not exactly taking up much extra room in the old hand luggage.