The Spelljammer Airships could be used in many ways.
1. Upgrade level 100 airships to a total customizable build that would be original from any other guild's airship. New Customizable parts will be purchased through the ddo store or with astral shards/diamonds to create new sleek designs.
2. There's already access to your guild airship through the cavern portal, but Spelljammer Airships can have a special airship dock within the Forgotten Realms via planescaller. The Planescaller will take you offworld into space (an asteroid or something) where your new airship will be docked.
3. New Spelljammer airship amenities.
4. Travel through space instead of over water.
5. New quests in space and other worlds.