From what I can tell, this fare only seems to work with a connection through LAX. I found it on
Google Flights, but it is present on ITA Matrix if you search for it specifically. It seems to be sporadically available throughout the remainder of 2019. If you're looking to maximize AS miles, it seems you can get JL coded flights in E for Premium Economy at $735. Otherwise you end up with AA coded flights on a combination of CX and JL.
AS and JL coded flights which
should earn 18729 AS miles, from what I can see:
AA coded flights:
If someone finds something better in terms of routing, coding, or pricing, I'd love to hear it.