Tried that earlier. Shows the following

The following error(s) occured
This trip cannot be found. It may have been cancelled. (4649)

That does worry me somewhat but could just be an issue with getting the flight ticketed. I know on the previous booking of this type it did take a day or two for the ticket to be issued, but this one seemed to come through straight away.

Off to check a dummy booking on AA.com to see if the seat reservations are still there.