Electric planes...

 Several companies are looking at making "electric aircraft" the idea is short range aircraft are powered by electric motors, the problem is battery technology is still not good enough.
 The battery has improved a lot over the years,  but the basic concept of different chemicals reacting has stayed the same, sadly the battery hasn't improved enough, it's drawbacks are capacity, recharging time, and battery lifespan.
 Until these can be overcome the reality of a battery aircraft is still some way off for the traveling public.  Lets face you you don't want to half way across the Atlantic and hear the pilot asking if any of the passenger has a charger and a very long extension lead.....