Why, then, are we preparing to say farewell? Not, it should be said, because of Concorde's venerability. The average age of BA's seven flagships may be 25, but aircraft ageing is chiefly determined not by years, but the number of take-offs and landings. The supersonic schedule was light - two daily runs to New York, a weekly winter service to Barbados, and a handful of charters. Compared with many Boeing workhorses, Concorde is a colt.