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Like electric cars, they have that nice abstraction layer where you don't _have_ to depend on fossil fuels. Just provide solar charging!

And where some of your footprint is fossil-based, industrial-scale scrubbers are a lot easier to install on the ground than loft into the air.

Or generate your fuel at each airport (algae), convert to biodiesel, and then dump into your tanks as usual.

Batteries may rule on the ground now, but we're a long way off from liquid fuel getting tossed aside in the sky.

For fuel generation, we're likely better off with using thorium power to turn air and water into gasoline.