A European Union-backed project called PACIFIC is focusing on understanding climate-neutral aviation to minimize non-CO2 emissions, which include water vapor and soot that create contrails. These streaks of clouds have fueled the chemtrail conspiracy theory, leading to mistaken beliefs about chemicals being sprayed from planes. Only 10% of flights create 80% of planet-warming contrails, mainly on long-haul flights. The PACIFIC consortium is investigating ways to cut non-CO2 emissions by testing sustainable aviation fuels to reduce contrail ice crystals. Additionally, Airbus is continuing research on hydrogen-powered planes to achieve zero-emission flights. The goal is to eventually eliminate warming contrails to address their contribution to climate change. While progress on hydrogen-powered planes has been slower than expected, hydrogen is still seen as a viable zero-emission fuel for aviation. The study aims to help identify and potentially eliminate the worst contrails for the environment, leading to a cleaner aviation industry in the future.