Power? Your worried about power? How do you even use a standard size notebook (notice I did not say large or micro, but standard), in that way to small a space they call your seat?
I don't know about you, but I have almost had my notebook crushed twice when the passenger in front of me tilted their seat back. Passengers with drinks spilling are a totally different topic. Power is not as important to me as keeping my notebook safe. No computer = no work = no pay.