Quoting from the link: > Current research is dedicated toward reducing the impact of sonic booms before they reach the ground, in an effort to make overland fl

Quoting from the link: > Current research is dedicated toward reducing the impact of sonic booms before they reach the ground, in an effort to make overland flight acceptable. Recent research has produced promising results for low boom intensity, and has renewed interest in developing supersonic civil aircraft that could be considered environmentally acceptable for supersonic flight over land.