Oilgae
Kiwiguy is bang on.
Credit to NZ based Aquaflow, who have developed a world leading process that has caught the attention of Boeing.
But although Algae based jet fuel sounds promising, it has one biiiiiig problem.
It doesn't like the cold of FL35+
In other words... any trials that publicity seekers like Virgin or Air NZ are running are a con.
The fuel will never be more than a 10%/90% blend of Olgae Jet A1 and the traditional stuff.
Any higher and it would freeze.
Air NZ know this... not that they'd ever say so publicly.
That's why the trial will be done on a non-paxing 744.