I am currently re-reading The Courtship of Princess Leia. The Chu'unthor was a Jedi training ship that on Dathomir about three hundred years ago. Now my question is why did the Jedi need this huge flying academy? Didn't the Jedi train Padawans in the temple on Corascant back then?
They used it the same way they used Djin Altis's (Callista's master) ship; to show students the galaxy during training and missions and find people not found by the tests.
Which was, in itself, a training enclave very similar to the Tales of the Jedi-era Dantooine facility; evidently there *was* a faction within the Jedi ranks who were in favor of reconnecting their trainees with the hoi polloi of the larger galaxy. And could explain away the differences betwixt the mannerisms of your average cloistered Coruscanti padawan, and folk like Callista.
And there's the fact that Lucas hadn't established the typical Jedi training method yet, so it was left open to the interpretation of the authors/editors.
The Power of the Jedi has a good description of this, all fitting current continuity. It was an experiment, and was about to be discontinued by the Council. By the way, its a Cerean word, Chu'unthor. (Oh, and there was other training centres for padawans - notably on Kamparas - see Holonetnews, its also where Jorus C'boath went.)
You're right, there was that other offworld facility that C'baoth attended; can't believe I forgot that one, since I just retyped that whole honkingdamned RPG sourcebook entry a scant week or so ago...
Kamparas, first mentioned in Dark Force Rising, was a Jedi-class training facility. One of the Callista trilogy books mentioned a Chu'unthor Altis flew. His own personal ship.