Saw quite a few goblin glider glitches here, but can't see this one. +Warlock only unfortunately.
1, Fly up high on your mount
2, Dismount + use goblin glider
3, Cast Eye of Kilrogg
4, Try to mount while using it
5, End the Eye
Attachment 12521
You'll be in full control of your mount, but with mechanical glider wings and when you dismount you'll gently fall to the ground. This lasts until you dismount or touch the ground.