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How about hybrid propulsion systems?

I agree with your assertion that complete electrification of the aviation industry is several decades away, but a hybrid solution should be optimally feasible given the advances in battery density and related industries. [0]

[0] http://www.eenewseurope.com/news/hybrid-electric-aircraft-ne...

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I think battery for commercial jet airliners might be a long way off, due to jet fuel's energy density. Small planes might manage.

One idea I recall from Virgin Airlines a while back was to have planes towed around the airport so they didn't have to burn fuel on the ground. Ah here we go (2006!) :

http://news.bbc.co.uk/1/hi/business/6203636.stm

I guess we'll end up creating fuel on the ground with renewable energy and use that for jets. This would go a long way towards reducing emissions and only needs minor adjustments to planes/engines. I believe some airlines already tested alt fuel sources as a mix (although they were based on plant oil iirc).

Hybrids are stepping stones along the way to full electrification. They reduce emissions somewhat. We may see hybrids be commercialized for small planes in 10 years, for large planes in 20 years. etc. etc.

What I'm saying is that I don't see these technologies allowing supersonic speeds, meaning supersonic=fossil.

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