I have just done my oneworld award this time using AA points.Although a break of 18 hours in NRT on way to the USA it was not counted as a stopover.This allowed me to stop over in NRT on the way home.
The hardest part of arranging a oneworld award through Aa was trying to get a QF flight.Although through QF there were plenty of award seats in business class to HKG or NRT,none were available to use as an AA award.
I must say however it was a pleasure dealing with AA who went out of their way trying to get around the difficulties and keeping the mileage to what I was able to afford-only had enough points for a 2500 mile award. ^