It's getting to be a long thread !!
Before I forget, the back middle row AC plugins are, as far as I know, on the Airbus. I can't say if Boeing has the same setup, but I'm pretty sure that they would have them somewhere on the airplane...
As for taking more power from the DC power at the seats than they are able to provide...I would bet that a couple of circuit breakers would pop before any overheating would occur. You should see the wall of circuit breakers that we have on the back wall of the cockpit! Electrical fire = bad (very bad if in wall)
I don't have any airplane adaptors or car adapters, but since laptop uses DC current, I would avoid any type of converters to AC which would convert back to DC. I think that's the setup used by Sager: the car/airplane adapter goes into the power brick that's connected to the laptop (DC to AC to DC) which might explain the large power draw (that brick gets pretty hot). I think that the "Direct Car adapter" from PCTorque might be it but there isn't much of a description. DC to DC. You'll have to use a car-to-airplane plug.
The brick outputs 20V 6 Amps = 120 Watts (right? W=V*C). I really doubt that the laptop uses all of it, but I'd be interested to see where that 95 W came from...Would it work on 70W ? I think it woud draw its 20V but get only 3.5 Amps instead of 6 so, I think
it would run but not have enough to recharge the battery at the same time and even draw from the battery. It would run longer than just on the battery...I think
The APC has a great solution to our problems, but Sager uses a stupid
power plus on the laptop that APC doesn's support: no compatible power tip to connect to the laptop.
More on In-Seat Power : www.elecdesign.com/Articles/ArticleID/7652/7652.html
APC:naturat's link & http://www.apcc.com/tools/travelpower/index.cfm