QR get the most publicity/noise on cancelled tickets. Probably also selling the most seats into AU
The current AU government regulations end 17 Dec. Based on that QR seem to selling more tickets.
Is 99.9999% certain the regulations will be extended. In the past when the date has been extended QR seem to have more seat cancellations. But is hard to determine
In late December (AU summer) will be 1000's of AU ex pats trying to get home. Most will fail.
3 Sept 2020 (gov.au) --->
Human Biosecurity Emergency Period Extended By Three Months
<snip>
The Australian Government will extend the human biosecurity emergency period under the Biosecurity Act 2015 by an additional three months.
The emergency period, which has been in place since 18 March 2020, will now be in place until 17 December 2020.
<snip>
Airlines flying to/from AU from
https://covid19.homeaffairs.gov.au/leaving-australia
But have also read about 20 airlines are flying to/from AU. DL is also now flying LAX-SYD