Ceremonial Chocobo Can't Fly...? Really..?

[Selli]

Wedding = ball & chain. They're heavy. Hence, the choco cannot fly.

Of course my logic is faulty because Fat Chocobo.

Well, it does say in one of their descriptions something along the lines of, "it can carry the burdens of you and your loved one". Apparently it just can't carry them Heavensward. XD

In all seriousness, they probably did it to keep people from cheating. One learns to fly and drives the other around to their quests and whatnot. I think they might make it similar to the wedding ring where you can't use it unless both people can fly/have mapped the whole zone.