The (older) A380s (380) registered 9V
-SKA to SKK are fitted with Y on the upper deck. 9V
-SKL to SKT (38E) have the all-J upper decks.
380s are deployed on:
*These services seem to have been operated by 38Es of late even though they're scheduled to be operated by 380s. I'm not sure if the schedules have been altered, but this might have been affected by the recent delivery of 9V
Edit: SQ1/2 (SIN-HKG-SFO v.v.) will be operated by 380s after 28DEC12, and SQ25/26 will be operated by 77Ws.
Also, there might be eqp subs on occasion.
[Edited 2012-09-26 08:44:54]