In 10.1.5 you will get a new mount for your horde character, and a new mount for your alliance character.
The horde mount is called Scarlet Pterrodax.
Alliance mount is called Harbor Gryphon.
How to get the mount
It is stated by a PTR blue post that you need to reach level 30 to receive a quest called "Time to Fly".
"Characters that reach level 30 will receive the quest “Time to Fly” and be awarded with a flying mount, Harbor Gryphon for Alliance characters and Scarlet Pterrordax for Horde characters."
- You have to ding level 30 in order to get the quest “Time to Fly”.
- You do not get the quest if you are on a level 30 character or above.
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