Typing "airship" into DDB shows a few hits for the DMG and Storm King's Thunder, plus of course a bit in the Eberron book. Looking at the DMG (P. 119) it does mention some basics that might happen if the party happens to own a ship, but ship-to-ship combat isn't really talked about. It mentions crew and cargo capacities as well as what would happen if someone were to attack the ship, but nothing about ship-to-ship combat or boarding actions.

"Airship" has stats, being mostly similar to sailing ships. You can add more detail, but the game still fundamentally expects that ships are a stage for the characters to act on instead of tools for the characters to actively use themselves. And in that sense the only difference between a seagoing vessel and an airship is that in the one people who fall overboard are screwed if they can't swim, while the other screws characters who can't fly.