[pierrem15]

Because the Concorde made a lot of noise and burned fuel like crazy. This new design is supposed to be quiet enough to fly over land and be efficient enough to be profitable.

[adorno]

Because the Concorde made a lot of noise and burned fuel like crazy.

They'll end up doing like the Concorde. Fly below the speed of sound over land, and then supersonic over water. And, you cannot defy the physics of what causes sonic booms.

And, to burn less fuel. the aircraft will have to be smaller with a lowered capacity for passengers. Or, go electric. ;) So, with cars/trucks we now have EVs, so with aircraft, we'll have EPs (electric planes). Yeah, that last part will never happen, since mid-air recharging stations do not exist yet. ;)