(EDIT: Title DEFINITELY was meant to say (78+) =S)
In northeast Storm Peaks, there is a cave of elementals called
Scion of Storm (for the quest of the same name)
Scion of Storm - NPC - World of Warcraft
When I stand here:
This is what I'm looking at:
When they die, they buff you with Zephyr, which gives you a 50% movement increase which speeds up your grinding even further. Most of them are flying, it's better to use a ranged weapon/ability to pull them.
This was the best farming spot for Eternal Air I've seen outside of Wintergrasp... but with MUCH less interruption. In fact, I've been farming here for about a week and have seen one person come inside the cave... and its a huge cavern full of these mobs.
The mobs drop:
Crystallized Air
Relic of Ulduar
Grey crystals that sell for a little over 3g a stack.
They have a good respawn rate and very few people go that far north.
I've made about 600-800g/hr farming here.
Enjoy.