Availability wide open, though have to book at less two weeks in advance. This is amazing use of delta miles!! One way Syd-jfk sells for $1,700!!
you will also earn MQM, MQS & MQD! And you can use global upgrade certificate if you have one of those.
Australia is open to vaccinated travelers without pre departure test
I am on my way back from Sydney using this, it was a great trip BH!
Check availability on delta.com