The amount of LA that they had to write-off was significant, but a risk of the business. Aside from that, I'm not convinced that LA, AM, and VS were bad investments long-term, especially given what they add to the DL network on day 1, they've just had some short-term struggles.
I've opined elsewhere on FT that CLEAR is a paid line-skipping service, not a biometrics ID company. There might still be a way forward for them, it's a bit dependent on how TSA feels.
Wheels up is an odd case – the thesis behind Delta Private Jets was that some flyers would fly private domestic and D1 international, but that did not necessarily seem to pan out. That later caused them to spin it off as Wheels Up because the synergies weren't there.
Now, a Philadelphia oil refinery...
In the era of free money, it might have made some sense for an airline to operate as an investment company, though you may lose the advantage of limited liability. Increasing interest rates are going to limit the ability of companies that are not a home run to get money, which is going to cull certain businesses.
When I was reading
DLASflyer initial post, I was also expecting a certain refinery to be part of the litany of woe...