No, no limits far as I can tell. I did it just fine on my mule that was lvl 19...I'd done the subjob quest but that was about it far as I can recall.
Funny thing, you can get the warp runes in adoulin, warp to Kazham without ever having gotten your airship pass. And you could get stuck there, except that you could get 50 points from FoV to use repatriation.
Edit: and that was just doing the quest, not paying the 1m. Already had the tele-mea crag so just teleported, s/i thru Maze, deathwarp back to jeuno.
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