2-860-677 - Heritage Space/Heritage Images

Access biofuels flight tests, USA. Highly modified Douglas DC-8 jetliner, (manufactured 1958-1972), used by NASA as a flying science laboratory. White exhaust contrails stream from the engines in this photo taken from an HU-25 Falcon flying in trail about 300 feet behind the DC-8. Instruments on the Falcon were measuring the chemical contents of the exhaust contrails at varying distances from the DC-8, which was using both standard JP8 jet fuel and a mix of JP-8 and a plant-derived biofuel.