Right! They used to have a commercial airliner that broke the sound barrier.
I was confused about how the article kept saying “hypersonic” without defining it. Looks like hypersonic means 5x the speed of sound.
https://www.dictionary.com/compare-words/hypersonic-vs-supersonic
Ears turn out to be a good way to recognize individuals. Ear biometrics is an evolving area.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7594944/