http://www.aviationtoday.com/2017/04/11/boeing-invests-hybrid-electric-aircraft-startup/
http://www.aviationtoday.com/2017/04/11/boeing-invests-hybrid-electric-aircraft-startup/
La start-up http://zunum.aero/
http://www.boeing.com/features/2015/01/corp-hybrid-01-05-15.page
[youtube https://www.youtube.com/watch?v=VAjbfevv9D0&w=560&h=315]