That's energy, OP referred to power, which normally means generated power in these discussions. All of the fossil energy is oil, none is coal, and I believe that's all used in transportation and a tiny bit of heating in the hinterlands.

I wonder how the flying in and out is accounted for in these sorts of figures, if hydrocarbons are ever replaced in aviation it will be dead last after everything else.

Okay. OP' parent referred to "global replacement for fossil fuels or it would have supplanted them already".

I found Iceland's "Fuel Use Forecast" at https://nea.is/fuel/forecast/nr/132 , which appear to be from 2007. It shows aviation as the biggest - and growing - consumer of fuel.

Iceland has so much access to power that they're likely to be the first country to export net negative carbon in some fashion: aluminum I'd guess, we always need that.

This won't involve burning less jet fuel and resembles a Papal indulgence, but maintaining an industrial civilization while decarbonizing industry is impossible without this kind of accounting.