Spelljammer Spelljammer References in the Core Books?

[Parmandur]

So, as a fun exercise, I went through the core books and looked for references to older published settings, and have been able to find explicit references to every major setting, including 4E Genricistan and isolated adventure settings like "Ggates of Firestorm Peak."

But, as far as I could tell based on limited knowledge, nothing from Spelljammer. I wonder if anybody else noticed any?

 

[TerraDave]

Hmm, they imply that most game worlds are in the same prime material plain...allowing you to fly ships in between them.

 

[Parmandur]

True; also, the reference to Githyanki sailing in the Astral Plane, maybe?