That there are "no seats" on that day on any flight. I requested they contact British directly to get it changed, but the CS basically runs through the same script that it has to be available on their end through the search, and I'm not sure why LY and VS would pop up but not an AA flight. Honestly, I'm tempted to see what happens if I take the outbound and let BA take control of the ticket, as my return is 2 weeks later, and the outbound has no issues.