HiyaIn Icecrown there're 2 ship things that fly through the air, one horde, one alliance. I haven't been able to see if there're places on the horde ship you can do this, but if you get onto your flier and fly towards something branching off of the boat (as seen in the video)
Then hover above it for a second, if you don't start trailing behind the boat then fly away, then fly back and see if it works when you get back.
If you do trail behind the boat, dismount over the object, and stand on it. as the boat moves you will stand in the air behind it.
[ame=http://www.youtube.com/watch?v=MINO9BKwpo0&feature=channel_page]YouTube - Float in Icecrown[/ame]
Why I think this could be useful is because you can still cast spells and use items (as long as you don't move) so you can cast spells (or possibly use ranged attacks) on enemy players that are flying by.