Why planes aren't electric. Yet.

Nope. I am super skeptical about electric planes. They are essentially super sized drones. Even the top drones can only fly for 20 minutes tops and barely carry any extra weight.  UAVs that military use to fly long hour or carry armed payloads still have turbine engines that use jet fuel. 

I see Drone technology combined with Turbine engines to make easier to fly VTOL air craft in the future. These will be use for Military Crew deployments and compete with helicopters for short trips by super wealthy.