Flying Requirements in 6.2.1ish

http://us.battle.net/wow/en/blog/19800551/dev-watercooler-flying-in-draenor-6-10-2015

It will require these current achievements:

• Draenor Loremaster - Under Quests > Draenor > "Loremaster of Draenor"
• Assaults - Under Quests > Draenor > "Securing Draenor".  If you don't have them you should be able to buy them in your garrison.
• Map Reveals - Under Exploration > "Explore Draenor". Use your feather if you can't find the specific spot.
• 100 Draenor Treasures Found - I don't think the achievement for 100 is in place yet.  Use the one under Exploration > Draenor > "Grand Treasure Hunter" and get your count over 100. There are addons to help and of course you can buy map garrison missions from a guy in Ashran.

And it will require "three new Tanaan Jungle reputations to be at Revered.