Airbus welcomes 50 per cent synthetic fuel milestone

http://eads.net/1024/es/pressdb/pressdb/20090929_airbus_synthetic_fuel.html

Paves the way for 100 per cent synthetic jet fuel approval

Airbus welcomes the latest steps towards the approval by ASTM
International, one of the largest voluntary standards developing
organizations in the world, for the use of a 50 per cent synthetic jet
fuel in commercial aviation. Synthetic liquid jet fuels can be made
from biomass, natural gas or coal. All of these are known as xTL
fuels.