there is also ongoing research into making the boom less audible & turbulent over land, which would enable cross-country flights:

>Graves explains that SonicBAT is an unusual test in that it uses a typical military aircraft with its loud sonic boom to help engineers better understand the sounds from future quiet supersonic aircraft

>"We're hoping we can eventually lower sonic booms to a low rumble," he said. "The goal is to eventually accommodate jets that can fly from New York to Los Angeles in two hours."

https://www.nasa.gov/feature/new-supersonic-technology-desig...

I'd hope that Boom is also working on such an approach