Air New Zealand, Boeing, Rolls-Royce and Honeywell modified the engines on a 747-400 to run on half Jet A1 fuel and half jatropha oil. The jatropha plant is pretty remarkable. This common plant from India produces nuts that contain 30 to 40 percent oil that can be converted into biofuel. It has been used previously to power cars, but this is the first time it has been used for an airplane.
What would be more impressive though is an airplane powered by a real Mr. Fusion from Back to the Future. You’d just need to stop be a landfill to refuel.