Aircraft engines are designed to be light, and sacrifice low cost and the ability to burn cheap diesel fuel for that.
Ship engines are the way round: their weight doesn't matter much, but it matters that they use the cheapest fuel possible.
Ship engines are the way round: their weight doesn't matter much, but it matters that they use the cheapest fuel possible.
Those are for military use, where speed matters but money is basically unlimited.
Small correction: aircraft engines generally use kerosene-based fuels (Jet A-1, Jet B). Also cost-wise, aircraft-grade kerosene costs more relative to other uses of kerosene since those applications can tolerate kerosene of lower quality than aircraft-grade kero.