Working good until level 15-18.

In a Ironforge area there's a closed zone, named "the airport".

There's a large amount of NPC's, a locked fly route, many airplane.

It's difficult to arrive, must be found the access through mountains, hardly after Amberstill Farm.

Here you will be found a continuous respawn of Frostmane( level 8-10) that comes killed in continuation from the guards (level 55). Becoming part in this battle take great amounts of experience and loot also greens. Tested until to the 1.9.

If you can get to the airport area, you can tag the frostmanes before the guards attack them. Make sure you do more dmg than the guards so you can get the xp and loot.