This is Regional Express (REX) Airlines' flagship, a Boeing 737-800 leased from Virgin Australia and bearing the registration VH-REX, alias the "Kay Hull". It's making its way down the taxiways, waiting to take off as flight ZL9 from Sydney to Melbourne. (No, I have no idea why REX's IATA (International Air Transport Association) code is ZL either; its ICAO (International Civil Aviation Organization, a UN agency) code is REX.)

I discussed REX and its flagship in some detail in image 0305 from today's shoot so I won't go over it again. I just thought it was worth looking at side on.