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jandrese | 5 days ago

Transatlantic shipping also. Planes require highly refined fuel though, while ships can burn most anything flammable, even really crappy biofuels. Hardly anything is worse than heavy fuel oil.

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bryanlarsen|5 days ago

Different types of density. Transatlantic shipping cares primarily about volumetric density, air travel cares primarily about gravimetric density.

So we can both be correct since OP was not specific. :)