Great idea, or horridly dangerous?

So here is the problem:
On airplanes the in seat power has a max output of 75 watts. My laptop power brick draws 140 watts, so when I plug it in the little green light goes off and no power is provided at all. I fly often and am software designer, my laptop is super powerful and is required for me to work on these long flights I take every week. I need a power solution!

And here is my good or terrible plan:
I want to make a pigtail power cord that has 2 male ends and 1 female end. Plug it into 2 outlets on the airplane and then plug my laptop into the joined lines. With a very limited understanding I am just thinking 75 + 75 = 150 so I am good!

Known issues:
I know that the one exposed male will be live once the other is plugged in. I will be careful and find this risk acceptable.

Concerns:
I am just wrong and this will not work.
I start a fire on an airplane.
Something worse happens and it blows the power out and we fall from the sky.