It may change, but one day this week QAN had according to SYD's website scheduled 141 'red tail' domestic departures from Sydney. All but 25 'red tails' were cancelled, while subsidiary Jetstar only operated five flights.
Competitor Virgin Oz also cancelled most flights.
If the problem is lower demand than anticipated, not a good portent. It will mean underutilisation of airport departure gates and less patronage of the airport's rail line, car parking and retail shops.
Many like me want to go overseas, but the constant changing of 'coronavirus' requirements at destination(s) including previously used transit stops, and the worry that at short notice idiot State Premiers like Daniel Andrews may again despite saying he won't, close Melbourne to new arrivals (even if one travels via SYD) is a problem.
Domestically, can anyone trust its lunatic Premier not to shut Queensland down again even though it 'reopens' on 17 December 2021?