Friends In Even Higher Places

The mount required to get this achievement is obtained through the Recruit a Friend program. Here is Blizzards official promotion details:

Step 1
The Invitation
Send a convenient email invitation to friends and family members, making it easy for them to create a new account and get started.

Step 2
Adventure Together
Meet the recruit in Azeroth (see Recruitment Form page for further details) and enjoy special in-game benefits for a full 90 days:
- Friend-to-friend summoning makes it easy to travel together.
- Bonus experience ensures faster leveling.

Step 3
Earn Rewards
If your friend/family member purchases a full copy of World of Warcraft and pays for a month of subscription time, you get 30 days of subscription time FREE!

If your friend/family member pays for two full months of subscription time, you'll receive an exclusive in-game X-53 Touring Rocket flying mount!

Just to clarify, the friend has to PAY for 2 months of gametime. So after upgrading to a full version of the game, you will not recieve your mount until they have been charged for 2 proceeding months.

Excerpt from an e-mail from Blizz after I inquired where the hell my mount was:

The exclusive Recruit-A-Friend X-53 Touring Rocket flying mount is a reward obtained after your recruit upgrades the account and either adds a 60 day Game Card to their account as payment, or has reached the end of their free 30 day period and have been billed for at least two months of subscription time (one 3 or 6 month subscription).

The quickest way to bypass this is a 60-day game card for their friend as it will immediately reward you with the mount.

These are the 5 Mounts and Feats of Strength you can currently get through the Recruit A Friend program:

Mount

Feat of Strengh

[item=37719]

Friends In High Places

[item=54860]

Friends In Even Higher Places

[item=83086]

Friends In Places Higher Yet

[item=106246]

Friends In Places Even Higher Than That

[item=118515]

Friends In Places Yet Even Higher Than That