https://gamingsym.in/wow-dragonflight-you-can-also-fly-properly-later/
Hazzikostas talks about flying in Dragonflight clearly on Twitter at the Developer Roundtable:
“At launch, you gain the trust of a dragon companion in the first or second zone, which you can summon to you on the Dragon Isles. This companion doesn’t start out very well with flying and has low stamina, but as your trust in each other grows, you can gradually relax these limitations. In the long run we still plan to fly on conventional mounts. It should just feel good right from the start and then only get better. We still have to decide how you upgrade your dragon. “