As part of a broader push on part of the aviation industry to reduce its carbon footprint, Airbus has conducted the first ever flight of its giant A380 jumbo jet using 100 percent biofuel, made up of primarily cooking oil.
— Read on newatlas.com/aircraft/airbus-a380-biofuel-first-flight/

Fuelling one of the 4 engines or all? How is this be “sustainable”? Will everybody stop cooking? How much edible crop land will be pressganged into this delusion? And, about hydrogen, as liquid, any failure will make Hindenburg look like kiddie’s birthday cake.