Why all this argument about an airplane that should never have been built? Concord (proper spelling) was a schoolboy's and housewives' dream, wow, the world's fastest, but had no range and no payload and was so utterly uneconomic that nobody bought it. The two governments who were daft enough to fund it had to provide free aircraft to their national airlines to get anywhere near to an 'operating profit'. There was an enormous waste of national engineering resources that would have been much better directed to a reasoned commercially viable project.
Apologies to all the good people who put so much of their working lives into the design and fabrication of Concord (proper spelling) but even they were fully aware they were getting off on technology and being paid to go in completey the wrong direction.