Is it legal to go supersonic?

Good day, I'm curious about the legality surrounding the act of traveling at supersonic speeds. Specifically, are there any regulations or laws that prohibit or restrict individuals or entities from achieving such velocities? Are there any international agreements or treaties that govern this matter? Additionally, are there any specific jurisdictions where supersonic travel is either explicitly allowed or disallowed? I'd appreciate any insights or clarifications you could provide on this topic.