At the same time, when Concorde stopped flying after the accident in 2000, people who used to fly on her, flew on other things, so these passengers weren't lost revenue wise.

Some people didn't fly at all when they would've flown if a Concorde had been available. And those who did fly on other planes paid significantly less.

A significant share of those customers must have been lost by the two companies that flew the Concorde, as the alternatives to it are commoditized and offered by many other companies.