I did a SDT on AA from DFW to INC to DFW today. We came into gate 123 and I did not take a train at all. Disembarking, turn right from the gate, walk past the first moving sidewalk, and look for the burgundy "transfer" gate 100-150 sign to the left. Go through transport security, where you will need BOTH your arriving and departing BPs. Go up the escalator, and the Korean Air lounge is to the left upstairs from gate 115 (with very nice shower rooms). From there it's a short walk back to gate 123 for departure. This was my first international MR and it was very smooth.