Where's the common sense in isolating Limsa till you're level 21

[Kraggy]

I got my airship pass at level 15. How'd you manage to hit 21 without moving past Limsa?

I ask because story missions pretty much take you to the other cities around level 15.

I found the ferry closed (on the Thanalan side) with a 'out of use' NPC message like backin V1 beta. I Googled it ('cos God knows SE's games don't tell you much) and found someone saying you needed to complete a level 21 quest to gain access, didn't get as far as looking for the airship unlock details. That's why I believed what I posted.