Boeing Phantom Eye is an experimental fixed-wing HALE unmanned aircraft built to explore very long-endurance, high-altitude flight rather than serve as a normal retail drone. It is most relevant to aerospace researchers, defense and aviation analysts, and readers comparing persistent unmanned platforms at the top end of the market. What makes Phantom Eye stand out is the supplied combination of a **46 m wingspan**, **96-hour endurance**, and **19,812 m ceiling**, which places it firmly in the rarefied prototype class.