This may be a nit, but, you will _NEVER_ see AC power at any, let alone all of the seats. Seat power that works with the iGo system is DC and is not conventional 110 AC.
Perhaps I was hallucinating, but when I flew from Auckland to LAX on Air New Zealand earlier this year, I had a 110V outlet into which I plugged my laptop's regular power brick. The most popular seat power is still the EmPower which needs an iGo or other special adapter, but you'll increasingly find DC 12V shaped like a car's cigar lighter socket and AC 110V with a receptacle that takes most common shapes of AC power plugs. You can find a reasonable overview here: http://www.seatguru.com/articles/in-seat_laptop_power.php In with the seat diagrams elsewhere on the site, it tells you what kind of power each type of plane has and where the outlets are. Too bad we're not likely to have Internet access to go along with them. R's, John