https://www.theguardian.com/technology/2018/jun/05/supersonic-flight-concorde-crash

Flying at twice the speed of sound was the preserve of the super-rich. If supersonic flight roars back to the skies, could it be more affordable?

You could tell without looking up that Concorde was on its final approach to Heathrow: its Rolls Royce Olympus turbojets made the same roar on landing as others did taking off. It was a treat just to watch it in flight, and many of us assumed one day that supersonic flight would be the norm, not a novelty.