The Quan's Dwelling scene should be availible at that point in the game, but you can go back and see it at any point from there on, so try it again when you get the Airship.

Quote Originally Posted by Bolivar View Post

Does anyone remember the name of the ATE in Treno where vivi visits where he used to live?
The ATE where you get the option to go to Quan's Dwelling is called "How He Ended Up Here". The ATE with Vivi in QD is "Home Sweet Home".