Trying to resurrect a gas-guzzling technology in the face of irreversible climate change is not "integrity" by any definition I've ever used.
This is a technology that could only benefit people wealthy enough to afford it. There isn't even a nice story to tell about how it helps humans as a whole.
The R&D that went into your phone can be derived from wall street types buying cell phones in the 90s.
As technology gets better, the probability that it will become affordable to the masses increases greatly. It's not guaranteed, but its definitely non-zero.
This is equivocation - parent was discussing the founders' integrity in the sense of whether they are running a scam, not the broader moral integrity of developing this technology.
While I am dubious about commercial supersonic flight (at least without significant investments in reducing emissions, though avoiding afterburning should already help), improved designs will at the very least lead to developments in the field, and possibly in related fields such as suborbital flight and spaceplanes.
You can be dismissive by saying it's equivocal, but I explicitly mentioned that I was broadly considering all definitions of integrity that I've personally used.
It may not be a dishonest company, but lots of harm can be done honestly.
This is a technology that could only benefit people wealthy enough to afford it. There isn't even a nice story to tell about how it helps humans as a whole.