US GDP: Korean GDP :: DL Share of JV: KAL Share of JV?
I like the direction you are going here, but I don't think that's a strong correlation for many reasons.
Just spitballing here, but a stronger correlation might be:
US Worldwide air passengers : Korean Worldwide air passengers
Even stronger:
US-Korean trade originating in US : US-Korean trade originating in Korea
OR
US-Asia ASMs by DL : US-Asia ASMs by KAL
OR
US-Asia ASMs by all US carriers : US-Asia ASMs by all Korean carriers
1) we need our fair share of the flying AGREED!