There is probably a market for 2-4x more expensive carbon-neutral aviation fuel. Most other fuel-consuming vehicles are better off going in a different direction, batteries or hydrogen fuel cells.
Probably. but, aviation margins are currently around 2.7%, while fuel constitutes 20% of their operating cost. Even if an airline switches a few of its aircrafts to 4x costlier carbon-neutral fuel, it's just so they can brag about it in their annual climate responsibility reports.
It is going to be hard to adopt 2-4x more expensive fuel across your fleet, just because.
It is going to be hard to adopt 2-4x more expensive fuel across your fleet, just because.