As an interesting aside ....
I had a line in the water, just south of Darwin a few days ago, had the trusty scanner tuned into either BN CEN or DN DEP (flipping between the two, can't remember which freq. i was on @ the time) and an outbound 717 (don't remember exact callsign) reported:
NXA : "NXA maintaining 6000""
CEN : "NXA short delay at 6000 due company traffic"
Looked up to see the outbound 717 heading south and an inbound QF mainline 737/767?? pass each other. Shortly thereafter :
CEN : "QANTAS 123 descent 5000"
CEN : "NXA climb FL330"
I'm presuming they were traffic for each other, which asks the ??, is the QFLink jet operation part of mainline domestic and not regional services like the Q400's ??
That would make sense to me. I would hardly call YPDN-YPPH a regional service.