Just booked for a friend:
12/31 EY SGN AUH J AA 30K
1/1 EY Apartment A380 AUH JFK AA90K
Found the apartment after refreshing etihad site a few times, low and behold EY Guest First AUH JFK was available, I then called AA Australia and they spotted the aprtment in no time, as I have read that AA US can be difficult for agents to find.