Pugnut, this website should show you if your airline seat has power or not: http://www.seatguru.com/
When you're on the ground in France, you don't really need a power converter. Your regular MacBook power adapter will work fine there if you get the correct "plug". Apple sells an "international kit" for $39.99 that has adapters ("plugs") for pretty much anywhere in the world, but there may be a way to get just the one you need for less.