With the Radar feed you have to select your region. Select YSSY monitor the aircraft progress while listening to ATC live, there is a definite time difference in the 2. For example UA839 appeared on the radar site at 8.20am (1 Feb 2011) this morning (local DST) It was not heard on the live ATC feed until 8.55am local, by which time it had already landed (as shown on the radar screen)