WWWWWWWWWWRONG!!!!!!!!
contrary to popular belief, BA operated concorde with huge profitability for lengthy periods of time, including after the concorde crash. What did for it was Airbus' cutting of replacement part supply.
Mmm, but that's a lot easier when you virtually didn't have to pay for the aircraft in the first place, and when tickets were generally several times times the price of a normal economy of business class fair across the pond. I expect if they (AF and BA) had paid cost price for the aircraft and its development, they may have made a little less of a profit to say the least!