Interesting but possibly impractical...
Green fuel for the airline industry - tech - 13 August 2008 - New Scientist
With over 20 years' production experience, Ben-Amotz is convinced that the maximum practical yield is 25 grams of biomass per square metre per day, of which 40 per cent might be oil. That equates to about 36 tonnes per hectare per year, meaning that to replace current jet fuel consumption would take about 65,000 km2, roughly the area of Ireland.