Originally Posted by mangoMan

I had the same problem, but finally got First to show as an option after a while. IIRC I first searched for economy and then on the left of the screen I could search again and First was an option in the pull-down menu for class-of-service. Sorry for the vague explanation, but I can't remember all the details.

I also believe that booking AA domestic F will cost you 3X Avios points vs. coach.