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Narrative: The solar powered Airbus Zephyr drone was lost during a test flight. According to a statement made by Airbus U.S. Space & Defense: "Following 64 days of stratospheric flight and the completion of numerous mission objectives, Zephyr experienced circumstances that ended its current flight".
ADS-B data show the aircraft was flying at an altitude of around 52000 feet until it began to descend around 04:52 UTC (21:52 local time, August 18). The latest data point was recorded about 05:05 UTC (22:05).