Oneworld benefits on non-oneworld issued ticket?
 

Apologies if this question has been already answered. If I use Etihad miles for an award flight on American Airlines (AA coded flight, so technically oneworld marketed and operated?) and add my BA Gold number to the reservation, will I be eligible for oneworld benefits?

Yes you will.

As Rami Tamimi said "Yes you will"

It matters not how you paid for the ticket (Etihad miles, cash, camels...) the important things are Oneworld-marketed and Oneworld-operated

However, your booking will show your Etihad FF number, so you might want to phone AA and see if you can change that to your BAEC number - that way your status will show on your boarding pass making lounge access etc easier