The third step in planning airport fueling facilities is to optimize fuel efficiency and sustainability, by reducing fuel consumption, emissions, and waste. This can be achieved by using renewable or alternative fuels, such as biofuels or hydrogen, where feasible and compatible with aircraft engines and fueling systems. Additionally, energy-efficient technologies and equipment, such as solar panels, LED lights, or electric vehicles, should be adopted for fueling operations and infrastructure. Minimizing fuel losses and spills is also important; this can be done by using leak detection and prevention systems, spill containment and recovery systems, and proper disposal methods. Finally, digital tools like software, apps, or sensors can be used to enhance fuel management and coordination by monitoring and controlling the fuel inventory, supply, and demand.