Originally Posted by Duke787

If you already know the trip dates, you can give Delta a call and find out if they have any Mileage Upgrade Awards available to either D1 or PS.

I would also recommend checking out mileage upgrade award availability on United. I've specifically flown on UA on past work trips to Australia / New Zealand under similar circumstances because I was able to do an MUA on UA with cash and miles -- although with pent up demand that might not be doable. If you are part of the Chase ecosystem, you can transfer UA miles over if you don't typically fly UA