I found nothing similar in my searches so this shouldnt be a repost.
Ever since Isle of Conquest released I have done this. In my opinion, the idea of boarding an enemy gunship to kill their crew and destroy their cannons is the most badass thing you could ever do.
[ame="http://www.youtube.com/watch?v=ogSHbrdvsVo"]YouTube- video unrelated2[/ame]
(BETTER QUALITY NOW! NOT EDITED, TOO LAZY.)
Once up there you can do whatever.. jump down on top of your own base, on top of the hangar, kill their cannons, mind control alliance off their own ship.. you get the idea.
Hilarity ensued once the Alliance started to teleport onto the ship, I had killed all their cannons.
Works on 3.2.2 retail, engineering (rocket boots+slow fall) required. As far as I know the Alliance can not board the Horde gunship. Tough luck.