I've been playing around in Dalaran and found out I can make certain NPC's (Most NPC's with a yellow name, although not all) attack my ghoul by telling it to use leap on them. I've seen a thread mentioning that you can use this to stop friendlys mounting, but not seen it used like this before.
Anyway, set your ghoul to leap at the flight master in Dalaran, and start backing up, telling your ghoul to follow you, trail the flight master somewhere out of the way, and get a healer friend to keep you alive if need be. I did this at level 60 and it took him a long while to take my health down. You now have the undivided attention of the very, very weak flight master who won't leave you alone.
This trick can also be used with all of the Dalaran vendors that I've seen, all you need is a place to drag them to.
I'll add a video in a few minutes.
Edit: Video added. It shows how long a 60 DK can stand up to the 'beating', so how long an 80 would last would most likely be a lot longer. Also, as you can see, nobody else aggroed onto me whilst trailing the flight master away.
[ame="http://www.wegame.com/watch/Baiting_the_Dalaran_Flightmaster/"]Baiting the Dalaran Flightmaster[/ame]
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