Originally Posted by christep
I read the OP as saying that these were direct (1-stop) flights on a single flight number, in which case that would be OK. But on consulting the OW Timetable they both look like two separate flights to me.
They are single flight numbers through April 2005, then discontinued, same as with the LAX-SJO nonstops on AA.
If the OP wants to do a summertime route with max. mileage, ending up with a flight to HEL, then the following offers a few more miles without breaking any routing rules AFAIK:
(HKG-) JFK-SJU-DFW-ANC-DFW-YVR-JFK or -ANC-DFW-SFO-JFK (I wouldn't give up a CX J ride for AA transcon but that's me.)