Quote Originally Posted by Inosaska View Post
Its only with the new expansion zones I think but not very sure.
It's only with the new areas. Square Enix would have to completely redo the currently existing areas if they wanted to allow flying mounts in them, because, as with most games, anything beyond what the player can see/get too isn't actually done.

Example: In beta it was possible to jump over the Carpenter's Guild in Gridania and leap into the lake near the airship port. You could then run all the way out and explore. Because this was never intended, nothing is actually out there. It's a bunch of 2D pictures of trees, not actual trees themselves.