Airship Guide

[Seraphor]

Having just inherited a dead FC due to the inactivity of literally everyone else in it (yay... I'm so lonely) I'm just now getting into Airships and Subs.
Can someone confirm, are Airships essentially 'dead' content now? Obviously they still exist and can be used, and people do use them, I see the cost of airship components is still fairly high on the MB, and presumably the materials you gain from airships are exclusive to certain crafting recipes for a few older yet still highly sought after items. But there's no new items coming from this content anymore is there? For quite some time now?

Subs seem to be at least twice as indepth, with 4 times as many maps to explore, and can bring back more than just crafting materials.
If I can write off airships, at least for the time being while time and resources are limited and I'm all alone , that'll be good to know.