Ok, first off, I searched through the forums and have yet to see this posted. So I apologize in advance if it was. This is a trick on how to obtain the skeleton buff from the Noggenfogger Elixir and remain on a flying mount. You need to be on Netherwing Ledge to do this properly.
1. When you are on Netherwing Ledge, dismount first of all, then drink a Noggenfogger to get the skeleton buff.
2. Then drink another Noggenfogger until you get the skeleton buff again. You will notice that your previous skeleton appearance will be gone and you will look like a dragonmaw orc.
3. You can now mount up and take off.