Can't correctly price trip with KE TPAC segment
Trying to book an open jaw, SFO-PVG/SHE-SFO. I'd like to fly DL outbound and KE inbound.
DL.com offers this itinerary with a reasonable price ($800 or so): SFO-LAX-PVG/SHE-ICN-SEA-SFO, where ICN-SEA is DL metal.
I'd like the ICN-SFO KE nonstop instead, but I simply can't get either DL.com, google flights or any OTA to price it no matter what I try.
When I force this itinerary on itasoftware, it shows a price of $5404.
Is there any hope to call DL to get this priced correctly, or does this indicate that there simply isn't a fare available for this itinerary?
Since DL and KE has JV, one would assume that DL should happily put me on ICN-SFO with a similar price to ICN-SEA-SFO.