On October 27, 2019 at 07:51 UTC, the US Air Force reusable “X-37B” spaceplane landed at NASA’s Shuttle Landing Facility runway at the Kennedy Space Center in Florida, USA. The Boeing-built spaceplane spent in space 780 days. The details of the unpiloted winged spaceplane’s activities in orbit remained largely secret. It was the fifth — and longest — flight in the program’s history.