I had never heard that Concorde was &quot;quite profitable&quot;; to the contrary, I believe it was heavily subsidized by its operators&#x27; respective governments as a point of national pride. e.g.:<p><a href="http:&#x2F;&#x2F;www.nytimes.com&#x2F;1981&#x2F;01&#x2F;09&#x2F;business&#x2F;france-extending-aid-to-concorde.html" rel="nofollow">http:&#x2F;&#x2F;www.nytimes.com&#x2F;1981&#x2F;01&#x2F;09&#x2F;business&#x2F;france-extending-...</a><p><a href="http:&#x2F;&#x2F;articles.latimes.com&#x2F;1987-12-01&#x2F;business&#x2F;fi-25795_1_supersonic-concorde" rel="nofollow">http:&#x2F;&#x2F;articles.latimes.com&#x2F;1987-12-01&#x2F;business&#x2F;fi-25795_1_s...</a>