Wow, thanks for the quick reply everyone. I appreciate all the advice. Time wise it doesn’t sound like I should be too concerned.

currentjer: Thank you for the link on Delta’s through-check policy. I imagine the same generosity wouldn’t apply I encountered delays out of CMH or MSP, or do they? So Delta is able to lookup the flight I purchased through Korean Air or would I have to give them some for my itinerary?

dll: My layover would be about 12 hours and my thought was to shoot into Seoul for the day. It’s been a couple years since I was there last and first for my girlfriend. Like I said it’s been a few years, is customs relatively east out and back? I vaguely remember it not taking long. I see that AREX takes about 45 min. to get to the city center, would 12 hrs. be enough?

Again, thank you all.