Heard whilst IFR out near Cowra.. ML CTR controller had been away for a few weeks since the introduction of JQs A320s.
ML CTR: Jetstar XX cleared FL120 when ready
JQ XX : Cleared FL120
ML CTR : JQ XX Ive been off and havent seen a A320 for a few years what speed can you do on descent?
JQ XX : Ah it changes what would you like? we can do 300.
ML CTR : rgr JQ XX maintain 300 , how did you get that speed?
JQ XX ( in a very typical captains voice ) well I just push a few buttons here and it tells me what to do ... and today it says 300.
ML CTR : (laughs) rgr JQ XX contact XXX "