The ultra luxurious battery-powered flying boat features a soundtrack by Hans Zimmer (Picture: Jam Press/Sbxcars.com)A luxury boat that flies above water instead of on it has gone up for sale – for more than £2.1million.Debuted during the Cannes Film Festival nearly a year ago, THE ICON showcased its ability to fly about one meter over water, ‘feeling no wave impact at all’, according to BMW, which developed it along with boat manufacturer TYDE.THE ICON is the world&rsquo