I think its nice that we're able to purchase guild airships at rank 15, but also I feel that it's almost entirely pointless to do so. Getting an early airship should be a benefit, yet all the benefits are stripped away when you realise that all of the hookpoints on the ship cannot be used and it cannot be customised.
While I perfectly understand the need to earn things, and I have no problems with the majority of ranked items nor the way the ranks work in general, I do feel there needs to be a few more things for those who got their airship early. My suggestions then are as follows.
1. Lower the requirement for airship customisations to guild level 15. I don't really see the point in applying a rank restriction on something which has no value beyond cosmetics. By customisations I mean paint jobs, interiors and sails.
2. Either add a new airship with more Crew hookpoints and less small hookpoints, or give us some amenities which can be placed in those small hookpoints. There are so few uses for them on the smaller airships, so they largely go unused until upgrading to a larger craft.
While its nice to have a convenient quick-travel around Stormreach, a guild airship needs something more before anyone spends any time there beyond getting from A to B. While im very happy that they have some contracts which you can use prior to rank 20, I feel it needs a little fleshing out to make it worth the Astral Diamonds.