NASA’s X-59 ‘quiet’ supersonic jet aces key ‘cruise control’ test ahead of 1st flight NASA's "quiet" new supersonic jet, the X-59, just passed a key engine test, bringing it closer to its first flight later this year. Astrobitica April 1, 2025 (Last updated: April 1, 2025) 1 minute read NASA’s “quiet” new supersonic jet, the X-59, just passed a key engine test, bringing it closer to its first flight later this year. About the Author Astrobitica Administrator Visit Website View All Posts Post navigation Previous: Fixing cracks in space bricks with bacteriaNext: Watch chilling 1st views of Earth’s poles seen by SpaceX Fram2 astronauts (video)