AOPA Asks FAA To Weigh Supersonic Limits Below FL180

The AOPA is concerned that pilots operating under VFR above 10,000 msl might not have the ability to see and avoid supersonic aircraft flying at supersonic speeds. 

https://www.ainonline.com/aviation-news/business-aviation/2019-08-21/aopa-asks-faa-weigh-supersonic-limits-below-fl180?amp