[jandrese]

You might as well complain about how they don't power their aircraft with unicorn farts.

I have never even seen a proposal for a supersonic electric engine. The only thing that's even remotely close is a bit of dabbling in nuclear engines in the 50s and 60s that were cancelled once people noticed that the idea was insane. Also, impractical--the radiation shielding was too heavy.

[rsynnott]

There were a few test flights; it was _doable_, though probably not economic.