From where to where?
Just looking for SYD as the AU destination will limit options.
And a return to USA? No need to fly the same route/airline/origin~destination
USA<--->AU business class awards are hard to get. For "Several months" out you may be too late. Wanting to travel Nov - Dec- Jan?

AS QF thread -->https://www.flyertalk.com/forum/alas...ng-thread.html

Airlines that fly USA/Canada to/from Australia.
Following the pandemic, routes are being re-established and some new routes. Schedules can change. Route restart dates subject to change.

• Air Canada AC YVR – SYD BNE [Star Alliance]
  
• Air New Zealand NZ LAX ORD SFO IAH JFK YVR – AKL – Australia various[Star Alliance]
  
• Air Tahiti Nui TN LAX SEA via PPT Tahiti & AKL. Last segment on QF codeshares. (AA AS partner) [SEA new route March 2023]
  
• American Airlines AA LAX-SYD [OneWorld Alliance]
  
• Delta DL LAX – SYD. [Skyteam Alliance]
  
• Fiji Airways FJ LAX SFO HNL YVR– NAN - BNE SYD CBR MEL ADL. (OneWorld Alliance connect.)
  
• Hawaiian HA HNL – SYD. Pre CV19 also used to fly to BNE ( AA VA partner)
  
• Jetstar JQ HNL – SYD. Pre CV19 also used to fly to/from BNE & MEL
  
• Qantas QF LAX SFO DFW HNL YVR* - SYD; LAX - BNE; LAX DFW - MEL. {* seasonal}. SYD-AKL-JFK from 14 June 2023. [OneWorld Alliance]
  
• United UA SFO LAX - MEL, IAH* LAX SFO - SYD, SFO – BNE, LAX – BNE from 29 Nov 2023 {* seasonable}.[Star Alliance]. (VA partner)
  
• and others via Asia, South America & Middle East