Fair enough, I was literally searching for the word. I assumed the history of noise externalities from supersonic aircraft might merit a broader discussion of

Fair enough, I was literally searching for the word. I assumed the history of noise externalities from supersonic aircraft might merit a broader discussion of externalities. It’s great that they are talking about air pollution, but I’d still argue that there are many other externalities to supersonic air travel, (and sub sonic air travel, and ground transport, etc) I just think we’d get saner transport policy and better innovation if we talked about them, and how to balance the benefits for people inside the vehicle for the costs to those outside the vehicle.