A little different question and circumstances but wanted to confirm.

We are flying qantas from shanghai to Sydney arriving mid morning and connecting to an evening qantas flight to Auckland. I'm hoping we can get both boarding passes in Sydney.

We would like to leave the airport so we will need a eta to leave, correct? Can our bags be tagged all the way to Auckland? This would certainly make leaving the airport easier and quicker. We also have global entry so we should be able to clear quickly, yes?

On the return we leave Auckland have a connection in Sydney not enough time to leave the airport, fly to hong kong both on qantas and then connect to a royal Jordanian flight from hong kong to Bangkok. This is all in the same day Since they are all oneworld can we check in once in akl and get all boarding passes and have luggage checked to bangkok?