I used to see Concorde most days when I lived in South West London. You could set your watch by it when it flew overhead on the approach to Heathrow. If I stood on the balcony outside my flat, I used to get a perfect view.
It has to be said it was very noisy. I always heard it before I saw it.
“As I understand it, Concorde was only able to do supersonic speeds over the ocean. That seriously limits its viability.”
It wasn’t able to do long haul flights. As such, no other airlines wanted to buy the aircraft. It was a great piece of engineering but a commercial failure and something of a white elephant.