[usrusr]

We didn't stop because we ran out of Concordes either and nobody would call them sustainable.

The article is truly disingenuous in this part because it starts with the sustainable claim, then goes on listing pollution as the biggest problem of the Concorde alongside two noise issues, as if building up to take them down one by one. Then it's taking down only the noise issues and calls it a day. In fact it even has to admit that the new plane will be just as range-limited as the Concorde was. This hints at the fuel issue definitely not being solved, given the 60 years (!) of engine advancements between them. (it isn't a sized issue, even business jets can reach quite impressive ranges)