Horizons fuel cell plane

What's more, the Hyfish fuel cell jet is remarkably quick, approaching speeds as high as 200km/h, performing a few aerial acrobatics along the way. And because of the way that it's powered, this jet emits zero emissions whatsoever. Now if they could only create a Boeing 747-sized version of this sucker.
http://www.youtube.com/watch?v=s4NSUA-soKs

http://www.mobilemag.com/content/100/354/C12423/