(Not supersonic yet - top speed 460mph (mach 1 = 761))
First flight Wheels-down (2 points, 6 months ago) https://news.ycombinator.com/item?id=45748035
Taxi tests (138 points, 9 months ago, 133 comments) https://news.ycombinator.com/item?id=44615033
Cleared for final assembly (90 points, 2019, 60 comments) https://news.ycombinator.com/item?id=21834889
I found a link that said they were discussing the testing schedule with media, but haven't found a timeline for when they might go supersonic.
First X-59 post on hn was 8 years ago!
"The X-59’s thin, tapered nose accounts for almost a third of its length, and will break up the shock waves that would ordinarily result in a supersonic aircraft causing a sonic boom." [1]
The video with the wheels up must be really satisfying for the people who worked on it. Beautiful.
[1]:https://www.nasa.gov/news-release/nasa-lockheed-martin-revea...