If it's a chemical reaction, it's definitely not coming from some conventional liquid fuel, this aircraft is way too advanced we're talking about ancient astronauts who came to us thousands of years ago in that aircraft, they certainly didn't travel millions of years with liquid propellants like kerosene for instance, that's just impossible it would require enormous quantities to carry around, it wouldn't fit in this ship
I think we're dealing with magnetic fields, zero-point energy and yes, helium
Mercury
Helium does not undergo reactions of any kind, unless you're thinking they had a tritium fusion reactor. So helium could be the product and its expelled out of a nozzle at the stern. They could also be using an unknown solid fuel with high energy density that we haven't discovered yet.
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