Quote:
Originally Posted by Fred Brackin
Places with significant atmospheres in our Solar System besides Earth comes out to Venus, Titan, Jupiter, Saturn, Uranus, Neptune and maybe Io. Of those Titan leads as a possibly desirable landing site by a wide margin.
Trying to guess about hypothetical planets/moons outside your Solar System with non-oxygen atmospheres and the biggest possiblity might be a sort of super-Mars.
So needing oxygen may not be that big a limitation
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The ramjet mode of the SABRE engine is air breathing, burning fuel using oxygen from the surrounding air, so it is useless in an atmosphere with no oxygen.
Titan would be great for an electric propeller plane and it could work in the upper atmosphere of Venus too.
XKCD Interplanetary Cessna