Today, while I was doing a quest Flight Training: Full Speed Ahead - Quest - World of Warcraft I was slacking a bit and let the Instructor go on without me, which resulted in him teleporting me back to the start.
When I was ported back, I noticed I could fly and use spells at the same time.
Here's the pic:
Attachment 10778
You can also use a ground mount to fly in Jade forest aswell.
I've tried going to a different area, but you instantly fall down when you leave Jade Forest.
You can dps targets while in the air aswell, but they start evading at some point, but still, there might be something you can do with this bug.
Hope you have fun with this, god knows I've had :P
EDIT: This is still working as of 13th October. You can fly without a mount and cast spells/use melee abilities whilst in air and you can also use ground mounts to fly.
The only bad thing is, you can only do it in Jade Forest. If you fly somewhere else it will automatically *dismount* you.
Mill