My brother-in-law is the ''well actually'' guy, and he actually does say that.

He is a man of clearly superior intellect, Rain Man level of recall for tiny little factoids about everything. it's just a shame that he always feels the need to prove his superiority with every conversation. This makes him often unpleasant, when he is otherwise a pleasant man.

I remember reading an article about the demise of the Concorde, and this was only partially the answer.

The Air France Concorde crash demostrated just how keenly the Concorde stayed aloft.

I can't remember the exact specifics, but a Boeing 747 with 3 failed engines could still make something like 200km. The Concorde, with one of its engines failing sank from the sky like a stone.

Unsurprisingly, this did not make people nearly as excited about travelling on a Concorde.