Aviation is in a huge rut. A major issue is that innovation is nearly dead. Want to bring a new aircraft to market? Got 5-10 years to get it certified while not being able to sell it to a market size of....? How about a new engine? In GA we fly 80yo designs around not because they are great, but because nobody can innovate to bring in the better stuff. I have a lot of hope for electric aviation because a new regulatory space and simpler designs may mean faster certification which could lead to real innovation in the space.

Every now and then there are some people who try to innovate in this space. Example: The guys from corsairpower (https://corsairpower.com/) who put a marine engine in a Cessna 172. However, it seems like they get stuck because of small market size, regulations and incumbents who don't want the status quo to change.

Don't forget that the incumbents will fight to keep regulatory barriers high.

I'd read this blog post.