It exists back home, so I can live with that answer.

[he rubs his beard, speaking with a small frown.]

It's a gas inside the airship and how its controlled that makes it work. I guess yours might use... wind magic to work. Kinda like a boat? Think of it like reverse displacement with air insteada water. Honestly, the weirdest thing about 'em is they get called Dirigibles down the line, instead of airships.