There is a flying demon in Suramar called Downfall and it can be enslaved by a warlock. You can reach the demon from nearby hills by using emerald wings + glider, or by gliding down from Dalaran.
When close to this demon, you get a debuff that lets you fly / float in the air. You can explore around Suramar and can also fly while in combat and can cast anything in the air. Tip: stay mounted while flying to make the demon follow you faster.
It doesn't do much damage but has over 10M hp which can be useful in some situations. I didn't test it with other peope but maybe it allows everyone to fly who comes nearby.
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