Concorde's "profitability" depended on British Airlines and Air France basically getting the aircraft for free, but that didn't help the carriers, because the Concorde passengers were drawn almost entirely from previous subsonic First-Class passengers. First-Class passengers on regular transatlantic flights were (and still are) enormously profitable, but barely break-even on Concorde. So every Concorde flight lost the carriers (and their competitors) a lot of money. ("Concorde Supersonic Transport: Issues of National Policy" Submission of Senator Birch Bayh to Secretary of Transportation Coleman. Congressional Record, January 21, 1976, pp. S217-S219.)
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Concorde's "profitability" depended on British Airlines and Air France basically getting the aircraft for free, but that didn't help the carriers, because the Concorde passengers were drawn almost entirely from previous subsonic First-Class passengers. First-Class passengers on regular transatlantic flights were (and still are) enormously profitable, but barely break-even on Concorde. So every Concorde flight lost the carriers (and their competitors) a lot of money. ("Concorde Supersonic Transport: Issues of National Policy" Submission of Senator Birch Bayh to Secretary of Transportation Coleman. Congressional Record, January 21, 1976, pp. S217-S219.)