How does DL "JV" on beyond routes if they don't have 5th freedom rights from Seoul? How does DL share revenues and expenses on routes/theaters it doesn't have authority to fly? It would be commercially lop-sided to KAL, right? Codeshare beyond Seoul makes sense; the leap to beyond routes as "JV" seems far fetched.

Is it possible this is "JV" on trans-pacific only?



Just some other data points:
airwaysmag.com (6/23/17)

"Delta and Korean Air have expanded their codeshare agreements extensively in recent months. Delta currently places its code on 655 weekly Korean Air flights between Seoul and numerous short and long-haul markets, including North America flights.

Delta is now carrying Korean Air’s code on over 4,300 weekly flights, primarily on domestic short-haul markets, but also on nonstop U.S. – Asia pairs, as well as a few routes from its U.S. hubs to Latin America."