There is quite a bit of talk of electric fans and fuel cells. I am extremely skeptical of this configuration. Fuel cells are clearly superior to batteries for aviation but I will bet on the evolution of the turboprop over electric propulsion for the next generation of commercial travel. Electric commercial aviation is two generations away, at best. For the argumentative types, I did not just write that electric aviation is two generations away. There will be plenty of electric aircraft in the air in the next five years. My point is that you won't be getting on an electric aircraft to fly to Hawaii in the next 15 years. Aviation is extremely slow to evolve. I have no doubt Boeing is working on new airframes and working with next generation propultion, right now. Not for commercial aviation, though. Boeing has the advantage of hosting drone development. When we start to see drones with high aspect ratio wings and next generation fan propulsion, we will know a new commercial airliner is just around the corner. If new technology can achieve half of what has been promised, airlines will be standing in line to get the new aircraft. Hopefully, Boeing will have purged most of their corrupt management by then.