As a JQ passenger leaving SYD this morning I made sure that I arrived in plenty of time to use the lounge in T3 even though my JQ flight was, of course, leaving from T2.
Unfortunately there is no JQ flight information posted on the boards anywhere in the lounge and no announcements are made for JQ flights. Also, when I asked at the service desk they weren't able to help and clearly weren't going to be bothered to pick up a phone to find out.....out of sight, out of mind.
As the lounges are available to QF & JQ passengers I think that a modicum of effort needs to be made for those travelling JQ who are willing to accept the walk across from one T3 to T2 for their flight.
In the end I had to spend most of my waiting time in T2 as the JQ flight departure time was pushed out and out with the poor conditions surrounding Sydney caused by the fires. It would have been much more pleasant to have spent that time in the lounge and being able to check on the flight status from there.