EADS had a pseudo model of an electric passenger aircraft at the Paris airshow. Apparently they like a hybrid approach: six electric motor driven ducted fans, a battery, and a single traditional jet turbine that assists on take off and generates electric power for the fans/battery. I'm curious as to what would drive a practical upper limit to ceiling for such commercial e-aircraft? Wing stall? Passenger compartment pressurization? https://www.youtube.com/watch?v=GlqX4m0R6E8 Also appears the above-wing mounted fans allow a return to fuselage quite a bit lower to the ground on take off and landing, avoiding these kinds of ground standoffs driven by current jet turbo fans.