The Diablo 3 main menu has a Cinematics button:
Where you can choose to view cinematics you've unlocked:
Except you'll notice there's no option to view Tyrael's Sacrifice again.
Where's the option to view Tyrael's Sacrifice again?
Diablo III – Where to View Tyrael’s Sacrifice Cinematic In-Game
diablo-3
Related Solutions
You can change region before logging in. Look into Account tab, inside Options menu.
As you said if you want to change region (this feature is available when all region has launched the game) you have to start a fresh character and you cannot do it "on-the-fly", but you have to exit and re-login.
It appears that logging out of the game or dying will definitely cause your wings to disappear, at least from what I've observed. I'm sure server resets and rollbacks could cause similar issues as well.
From what I've discovered so far, there is no way to make them permanent.
The wings are pretty awesome! I just wish they could be hot-keyed, instead of having to open the inventory and click to toggle them. Oh well!
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Best Answer
https://eu.battle.net/d3/en/forum/topic/4209931810 This forum solved this issue for me, i was missing tyrael's sacrifice - the best cutscene!