The Flight Paths category lists the covenant-specific flight paths (Sinfall for Venthyr, Elysian Hold for Kyrian, Heart of the Forest for Ardenweald and Bleak Redoubt for Necrolords) as unobtained flight paths, despite the fact that only the one for a character's specific covenant is actually obtainable.

Noticed this as well, quite a lot of things are showing up despite being covenant-locked
perhaps a filter option to not show anything that isnt obtainable unless you switch covenants?

in account mode this and class specific flight paths need a text to know the covenant/class to learn this flight

I think we have beta feature "Use more colors" for that. It should work with classes already but covenant color coding might be added later.
Ah, I guess you mean our usual text in the tooltip if something is class specific. I'll check it, but it's a separate issue.

Also Starlit Overlook and Dreamsong Fenn (both in Ardenweald) seem to have been straight-up removed

Flight Paths now account for Covenant requirements :) So I think we can close this issue.