I had no problem grabbing 2 F seats over the Christmas period this year, from previous expereince, you had to call often, the Agents tell me, that Etihad opens up seats from time to time, but there is no set rule on when and how many
where are you trying to go from? if as your profile says, ask the agent to look at other departing cities, ORD, DFW etc. you might find better luck and as long as there are sseats on AA you should be fine