Quote Originally Posted by odie View Post
He came out when flight wasn't a thing yet. Nowhere did it say Sleipnir would be a flying mount when you purchased him. Unless you were ignorant about the mount details and purchased it after HW, then you knew full well you were paying that price for a land mount, nothing more.
Same thing can be said about Fenrir. Nothing said that Fenrir would be a flying mount. It also came out before HW. (Released in patch 2.51.)
But since people kept whining on the forums about how they felt robbed that they had to spend all that MGP for it and it didn't even fly.

So there is no reason that Sleipnir would not be able to fly now.