1) Go to Netherwing Ledge / Dragonmaw Fortress
2) Bring out Mojo
3) Start to mount, right before you mount /kiss your frog
4) Fly out of Dragonmaw Fortress / Netherwing Ledge and wait for the frog debuff to wear off
5) You now have the netherdrake outside of the dragonmaw places!
I find that this is a lot easier to do in Dragonmaw Fortress.
Movie:
[ame]http://youtube.com/watch?v=NHXY5dEzh5A[/ame]
You can also use this to be on your own flying mount as a dragonmaw orc, just do the opposite.