I want my own airship. It feels wrong always having to pay to use one.
I'd like something that I could build and customize myself. Start with a quest to get something just big enough to transport myself. Then spend a fortune buying parts and doing quests to learn how to assemble them. Over time, be able to upgrade it from a personal craft, to transporting a party, then big enough to carry an entire linkshell.
I'm not as concerned about people who aren't riding it being able to see it. If everyone could see every airship flying overhead, you'd never see the sun in the more popular areas. Something like the way it is in XI would be fine with me. Just without having to pay for it, and wait for it to arrive. No need to show it off to everyone, just those worthy enough to come inside.
It would probably turn into a taxi service, like teleport spells are now. But I always preferred paying someone to teleport me to paying an npc for anything. It helps those not interested enough to take the time or invest the gil in having their own.
Just my ideas, good and bad.
What are yours?