Never fly in the US. Too many parties have a vested interest in the status quo as far as IC engines are concerned. Just like fuel cells and advanced batteries, this is a “rest of the world” technology, and not allowed to take hold in the US.
If you push the idea, it WILL be outlawed. If you don’t believe me, ask why LA no longer has a subway/streetcar system.
Do not challenge the established order, only multinationals who can profit from game changing technologies are allowed to do that.
LA has both not extensive be both do exist ?
At some point, there will be a storage medium that will rival gasoline’s ease of use and energy density. May be a hundred years or next week, but it will happen...................