Why is it that there is on some days a substantial difference in reward availability for the same BA flight using AA miles versus BA miles. For example, on May 14 from JFK/EWR to LHR, AA has BA184, BA112, BA174 and several other BA flights available in F using miles. But none of those BA flights are availabile on BA.com; BA has no F reward availability at all that day. I have checked AA availability both using the "Awards/OneWorld" KVS search engine and also by calling AA directly. The BA NON-availability I confirmed both on BA.com on also the KVS BA search tool.