Well, I finally found an exploit where I could contribute to the community. For too long I have leeched.
I do not know if this still works or not, Blizzard could have found it and done some fixes already. I cannot guarantee!
I got Hellfire Superiority when attempting to fly in Azeroth last night as a druid in flight form. I did the following steps. This will only work if the Horde have the 3 PvP basses captured out in Hellfire Peninsula.
1. Go to Outlands Darkportal.
2. Get into flight form as a druid
3. Click the Orgrimar / Stormwind portal
4. It will teleport you to Org/Stormwind and will take you back to your normal form. Notice you will still have the buff.
I do not see any other posts on this exploit, but I do not claim to be the founder, I bet someone else has found it by now.