One problem with ethanol, made from wheat or corn etc or bio jet fuel, made from canola or soybeans etc is the fuel versus food debate.
A 200ha or 500 acre Australian broad acre crop paddock will yield about 2 tons per ha with canola. A ton of canola seed will yield about 400 litres of oil, the other 60% is a useful high protein animal feed, nothing is wasted. So our 200ha paddock will produce 160,000 litre of jet fuel per year plus the animal feed.
160,000 l is enough fuel for a 17 hour flight in a 777. Do we have enough paddocks?