I thought that I had my ex-ICN DONE4 itinerary finalized for ticketing, but I got this response from the CX reservation desk in ICN:
"Oneworld e-tkt do not accept open segment for RJ AIR."

1. Expert Flyer shows D9 for CAI-xAMM-ATH for RJ508/RJ131 but neither AA nor CX could see this for 4/14 or 4/15 or 4/16 dates. In fact TWO seats are not available in either 'L' or 'D' for any of dates, according to both of them, with the problem being the CAI-AMM segment. Expert Flyer states otherwise.
2. So, I'd inquired in the Oneworld forum if there's a way around it and I was informed that I could keep these segements open-dated and that I could then call RJ and confirm the dates. [Thread here]
3. But the CX reservation agent claims the following:

"Oneworld e-tkt do not accept open segment for RJ AIR.

We need to input waitlist segment to issue the ticket,
but the response was always UC(that means even waitlist
not allowed)"

Am I SOL at this point and need to find alternative routes? I can choose CAI-LHR-ATH or CAI-MAD-ATH but both of these involve a lot of travel time and the CAI-LHR-ATH will also incur additional taxes...