Was hoping to borrow the expertise of the folks in this forum as I'm not too familiar with one world awards. I fly Delta for the most part. My nephew is going to Australia to work for 6 months and my present is a ticket to get him there. He would like to spend some time travelling on the way home. Is this itin. possible, if yes how many miles for a coach award. Thanks again for any help or input.

ATL-LAX on AA stopover 3 days
LAX-SYD on Quantas

Return out of HKG or BKK or any Asian airport 6 months later on either Cathay or BA to somewhere in Europe, preferably London, but anywhere is fine for his purpose. He'll find his own way back to ATL.