The Airship Dock is where you can trade with the cities within your kingdom.
There are 8 cities in your kingdom located around the map.
These are:
Kingsdor City
Sunsinger City
Nightspear City
Steambeard City
Moonseeker City
Anthropos City
Flamehammer City
Bloodbite City
Trading with each of these cities provides you with materials to use for other parts of the game.
The travel time to get to any of these cities can be cut down by doing a help request in your guild.
Each help given takes around 50% time off the travel time to or from the city.
The manufacturing time can be reduced through research, equipment, boosts etc.
The Airship Dock is located west inside your castle next to the Arcane Sanctum.