When the gas turbine engine first released to the aviation market, aircraft capabilities as we knew them were drastically changed. With such engines, aircraft could produce massive amounts of thrust from fuel combustion, allowing airliners to travel great distances with high speeds. Nevertheless, these aircraft and their respective engines require vast amounts of fuel, often ranging from 35,000 to 85,000 gallons. While aircraft may be filled with a little more fuel each trip than they need to successfully carry out a flight operation, it is still paramount that pilots precisely monitor and log fuel consumption rates for safety, weight and balance efficiency, and more. As accurately monitoring fuel is critical for flight operations, companies across the world strive to constantly improve our abilities to conduct such measurements. In recent years, the Fluid Systems Division of Parker Aerospace has partnered with Oxsensis Ltd. to create an optical-based system that is set to transform how pilots perform in-flight fuel monitoring.