ElectroVlasic
Apologises, perhaps I did not make it clear as regards my views on Boeing’s Sonic Cruiser project. The opportunity cost is the real issue, whilst as a you rightly say the expenditure on Concorde was of a different order of magnitude, however the design team should have be directed by management to focus on bringing the core product offerings up to date.
If they had perhaps focused on either the 7E7 or the next generation of aircraft for the 737 / A320 market slot, they doubtless might have been close to making the first test flights / deliveries imminently.
Commercially embarrassing, well frankly yes, for the long-term advancement of aviation, perhaps not.