Thanks for the help. The One World Award is the way to go. You do have to return to the same city. 2 open jaws was a no-no. Booked him

ATL-LAX layover 3 days
LAX-SYD Sydney for 6 months
HKG-LHR layover a couple of weeks
LHR-ATL

Great circle and AA had the mileage come in at 19639 mi which is going to run me 100,000 miles for a coach ticket, he's young he'll like coach , not a bad deal.