The extra fuel cost on Concorde is less than $400. This is a trivial extra cost for a plane that sells only first class seats, and at up to $12,000 each. At a price like that, it really makes no difference at all whether the fuel costs $99 or $474. There is still over $11,500 gross profit on each of those tickets!
Let's cost this another way. If Concorde flies roundtrip between London and New York, with all seats sold at full price, it can earn close on $1.2 million dollars. Subtract fuel costs of $47,400 and it still generates $1.15 million in positive earnings. A 747 flying full will earn about $800,000, with fuel costs of $40,000, leaving $760,000 in positive earnings per flight.
A Concorde is more costly to maintain than a 747. One rule of
is that Concorde's total operating cost is three times its fuel cost. I don't know what the comparable rule of
is for a 747, but let's assume that a 747's total operating cost is twice its fuel cost. This means that the total cost per passenger on a roundtrip across the Atlantic is now $1422 for Concorde and $198 for a 747. It is costing the airline an extra $1224 to fly a person on Concorde instead of on a 747.
This difference is still trivial when compared to the $12,000 fare on Concorde, and a Concorde can still generate $1 million per roundtrip in profit, compared to 'only' $720,000 for the 747.
Even after allowing for the extra fuel and maintenance costs, Concorde can earn 40% more money per flight than a 747.
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