Concorde
Re:- The Concorde diversion.
Sorry, the demise of Concorde had nothing to do with the Paris crash. The truth is that many decades previously, it had only sold a handful of airframes, and only to national carriers who were obliged to take it. Had it been designed to sell in such low numbers, its price would have been ten times as high. The truth of the matter is that Concorde failed to sell because:
The US disliked it for nationalistic political reasons.
The sonic boom made it unrealistic for overland operations (the biggest market).
The passenger capacity was very low.
The range was pretty low too, and a fuel-stop defeated the object.
The airframe price and fuel burn was quite high.
As to the A380, it is a big beast and has demonstrated its unsuitability for many airports with several high-profile collisions. And an airline has to be confident of filling this leviathan, otherwise it will make a thumping loss. I can see the reasons for their reticence. And the fact that it looks like a pregnant turkey does not help. Remember the old adage of: 'if it looks right.....'