How is air travel returning to supersonic speeds?

It’s exactly half a century since two Concorde jets took off from Paris and London respectively. The supersonic jet would come to define top end luxury travel. But Concorde has also been retired for nearly half that time, famously making its final flight to Bristol, UK where it was built, in 2003. What is Concorde’s engineering legacy? And will supersonic speeds ever be a reality for air…