Fun fact once flights go above a certain length they get less efficient because all that fuel they are carrying actually requires more fuel to move, which in tu

Fun fact once flights go above a certain length they get less efficient because all that fuel they are carrying actually requires more fuel to move, which in turn needs to be carried. I don't think it's the energy efficiency that's the issue here. Even if trains are less energy efficient, they can much more easily be powered off renewable sources.