Well, 1&#x2F;100 the cargo and 1&#x2F;10 the speed means you need 1000 solar planes for every kerosene plane for the same route revenue. If we assume they cost the same to buy since they are the same size. And that doesn&#x27;t take into account night flying etc...<p>Much better to have the solar panels on land and do synthetic kerosene for planes.<p>Ships go half the speed of Solar Impulse, but they have a lot more payload per dollar invested.