I agree with you regarding the chartered private jet trends. Actually I've seen ads on Instagram this summer by a European company with a semi-regular charter schedule to 4 or 5 cities and a Taiwanese company promoting the ferry sectors for people more flexible with the timings. Although both are targeting short haul routes at the moment I believe the trend will expand to long haul at some point. And the fact that they are putting ads on Instagram means they are not exactly just targeting the super rich but also the younger market as well.

However I personally think it is still early to tell the trend for Y. The little boom during the summer shows that some people are already used to traveling and won't give up so easily once the situation stabilized. So once the vaccine is delivered, even if it's less than the 90% effective rate currently suggested, there are enough people willing to fly again leisurely. There is chance that future Y will be quite similar to pre-covid.

Lucky for CX that now the 777X is at least delayed, they might have chance to review the future demand for F. For many people not quite there yet for chartered private jets, a good J can satisfy most needs showing by the Qsuite for example.