Earlier quoted context omitted.
Well, Boom is not any aerospace company, they want to make supersonic planes. Supersonic travel is expensive and environmentally unfriendly, and it will probably always be, because it requires more energy, because physics. All that for the minor advantage of saving a couple of hours on select flights. What it means is that it is a privilege for the wealthy (because it is expensive for what you get), at the expense of…
I think that take is a little cynical. If it's only for the rich then the prices will be high. Meaning the capitalist mechanism of resource distribution will be even higher (more paid by the rich received as income by the non-rich). It will also take demand from existing airlines making fares lighter for everyone else. It also employs people. It also drives technology forward. And ultimately it does let people travel…
Emissions are usually compared in amounts per passenger-kilometer.