Originally Posted by
shd9
Sorry for not making it clear - I meant that AA won't through check bag anyways if the concerned flights are in two PNRs, no matter it was AA-AA or AA-AS. OP seems to stress the inability to find suitable AA flights LAX-SFO, but in reality, the carrier of the second leg isn't relevant.
YVR-JFK-HKG-JNB is an impressive routing! Is it pricing out as one AS award (or is it even an AS award)?
Yes, I concur that AA won't interline to AS. AS doing so though is a great feature and they have interline agreements with a lot of airlines.
YVR-JFK-HKG-CPT was
one AS award. AS policy is that they generally won't fly you East to fly West (TPAC) but policy seems to get bent, even ignored for their Elites, at least in my experience.
I orginally booked the two awards separately in J. YVR-JFK for 25K & JFK-HKG/11 days/HKG-CPT in J for 62.5K Plans changed and I was able to change the YVR-JFK segment to a few days later in F, 2 pax. Since the time between arriving in JFK and departing for HKG was now < 24 hours, AS combined the two awards into one, refunded the miles for the first award and I paid 7.5K miles more to fly the first segment in F. Total 70K Mileage Plan miles. From CPT we flew back to YVR on BA in F. I will never do that again!

Flying AA PE SCL-DFW-ICN was better....
One of the best features with AS redemptions is the stopover on one‐way awards. I booked an EK J award DXB-JFK for October back in January but I doubt I will fly it now. The routing EK-J-DXB-LAX/2 weeks/AS-F-LAX-JFK as one award.
A little off thread topic but it does answer your question.
As an aside, the JFK-HKG flight technically wasn't a TPAC. We departed NE from JFK, flew up the East coast of Greenland, across the Artic Ocean, down over Rusdia and China before seing the Pacific on decent into HKG. Odd routing, even the Pilot said so himself.
Unfortunately CX YVR-JFK is now defunct.