Unfortunate news that Aerion Supersonic is shutting down. A lot of good  people have been working hard for years at the company to introduce their vision for supersonic flight. I personally know a number of their engineers and executives. Wish them all the best.

https://www.floridatoday.com/story/news/2021/05/21/aerion-supersonic-abruptly-shuts-down-citing-challenges-securing-capital/5208809001/

Engineering, customers and partners are not all that are needed in such a high-capital project. Need capital that understands the risks and rewards.