I cannot see it being in anything but a major update/expansion, airships are meant to give Companies somewhere to travel to and do things from what I recall. That is potentially a lot of content that I can't see being added in 2.51 or 2.55 (or whatever), not unless "You require a Free Company with an Airship to enter the Gold Saucer" is a thing that'll blow these forums to hell... I'd expect, and hope, 3.0 for it.

That said, I'd like to at least have the workshop there if only so I'll know where the door to it will be... Could ruin the rooms layout and all...