Benign weather assists today in creating favourable operating conditions. The most adverse capital city summary BOM suggests is 'possible storm in Darwin'. It is only a minor airport if flight numbers are the metric.
QF765, the 0735 hours morning MEL-PER diverted to ADL so that may well have been for extra fuel. The refuellers went on strike from 0400 AEDT.
So far today ex MEL (bearing in mind that this will often mean another flight is cancelled in the other direction), QFd cancellations have been or will be:
QF410 0700 hours to SYD
QF2087 0815 hours to BWT
QF677 1015 hours to ADL
QF771 1325 hours to PER
QF626 1550 hours to BNE
QF462 1600 hours to SYD
QF476 1745 hours to SYD
while QF11 to LAX, the scheduled 1120 hours did not become airborne until 1424 hours early to mid afternoon.
Earlier, QF151 (0900 hours MEL-AKL) didn't become airborne until 1051 mid morning.
QF779, the 1610 hours afternoon offering MEL-PER is predicted to depart at 1700 hours, presumably due to refuelling delays.
After Saturday (when no large scale sporting events or concerts are on) and perhaps equally with a typical non-school holidays Tuesday, Wednesday must be relatively quiet for passengers compared to a typical Monday morning or Friday/Sunday afternoon.