Originally Posted by SFO777

Only if KE has an interline agreement with JL and, is so, if the KE ICN agent knows this and agrees to check your bags thru. Absent an interline agreement, it won't work.
Do you really need to check bags?

Originally Posted by CPH-Flyer

Interline agreement in and by itself is bad indicator. BA has an interline agreement with AA, but also has a policy of no luggage checked through across separate tickets.

Korean and JAL has a code share operation on the Korea Japan routes. So there is also an interline agreement for sure. But a question for the Korean airlines forum, how does KE handle luggage across tickets?

Originally Posted by cdizzle11

If you were flying the ICN-NRT route on a JAL ticket / KE metal; it will be fine. Myself and another member have done the same thing recently.