Etihad is a partner, just not a one-world partner. You can earn and redeem AA miles on Etihad, but there are no status benefits. Here is a list on non-oneworld Airline Partners:
Air Tahiti Nui
Alaska Airlines/Horizon Air
Cape Air
EL AL
Etihad Airways
Fiji Airways
Gulf Air
Hawaiian Airlines
Jet Airways
Seaborne Airlines
WestJet
Alaska Airlines is the only non-oneworld partner where AA status yields benefits.
More information may be found on the
AA Airline Partners web page.
Note: If you flew an AA code share flight on Etihad metal, you will earn elite bonus miles.