I will tell you from recent first-hand experience that the award inventory is actually bookable (assuming award inventory has been allocated for that flight) 2 days prior to it being made available on AA.com. I saw it on expertflyer, called the EXP desk and got it. When I asked why I didn't see it on AA.com she said AA.com always has a delay of 2 days for some unknown reason. YMMV.