You know what's better than being carbon neutral? Being carbon negative. I'd rather Prometheus pull carbon out of the air to help cover existing fuel needs than to just offset a huge increase in jet fuel usage.

I fail to see how building yet another luxury transport service will meaningfully help the world compared to tackling some of the bigger problems in energy and environment. Especially since there's no possibility that Boom is more efficient than existing modes of travel.

Would this even be carbon neutral? It will require a lot of power to process carbon out of the air, and will go back in the air when they burn the fuel. Not to mention the logistics and manufacturing of everything involved.