Why would Virgin be appended to the ATRs when they are effectively a different business? I'm only presuming this by just looking at the Virgin Group's list of different businesses and associated callsigns...
Virgin = Virgin (duh)
Bluebird = Pacific Blue
Bluey = Pacific Blue flight operated by Virgin Australia crews
V Oz = V Australia.
Same applies to Qantas and QantasLink. Imagine a mainline driver hearing those 'turboprop riff-raff' using a Qantas callsign
(But then, go figure about Jetconnect).
Just my two cents worth, happy to be corrected.
Fuel-Off