Pretty sure Virgin Australia award availability just isn't showing up at all on Delta right now and hasn't for a couple of days. Seeing direct (LAX-SYD, LAX-BNE) flights that are available for business rewards in VA's system that aren't showing up in award searches on Delta in June, October, and February. Called DL diamond desk and they confirmed that they're seeing the flights as DL flights operated by VA (even though it's really VA 8) and that they can't make award space on those flights. Woman I spoke to said she would contact the JV desk to see what's going on.