Just because these seats don't show up in the online search engine doesn't mean that they are not bookable by AA/AS. These programs have had a long history of that. When QF had their massive award drop last feb, none was visible on AS or AA. But based on personal experience and the dozens of datapoints that existed online, I believe all of the space was still bookable by AS/AA. I have made multiple CX J/F bookings this year using AS miles.