I am trying to book a trip for early next May. Because there are specific days I need to travel on, I am trying to book as early as possible. I had no problem with the AA portion of the trip, but AA says they show no award seat (seats are available for purchase) availability at any time on one of my days (5/7 from AMS to LHR) and could not explain the reason, but said to try back and see if seats had opened up.

Does anyone know if BA usually opens up seat availability later, or should I just plan on purchasing this ticket? It usually is a fairly cheap flight, so its not that big of a deal, but it seems to me there should be some availability this far out.