Photoagriculture/Shutterstock Save for later Print Download Share LinkedIn Twitter Not all sustainable aviation fuel (SAF) plants are created equal. Differences in feedstock, production technology, policy support, geographic location and logistics will all play a role in determining whether a facility can achieve the necessary economies of scale to eventually become profitable. Neste and World Energy have a massive head start over plants that are on the drawing board or under construction. US downstream firms such as Marathon Petroleum, Phillips 66 and Valero, which have converted conventional refineries into renewable fuels plants, are not far behind.