Thanks for al the info..
Problem with my airline is that they provide an Ipad for aviobook and lido. But we do not have a proper charge socket for it. Also no usb port.
So thats why many of us do use the onboard socket. I have never had any problems, not even a warm feeling charger.
But just recently I had a duscussion with a colleague who was totally against using it.
So I thought, lets get some facts Straight.