Rather than create a new thread I thought I would post my experience of this transfer.

My journey was GLA-AMS-ICN / GMP-USN with KL (GMP-USN on KE metal).

At check-in at GLA I was told that there was no way I could check my bag all the way through to USN, I was going to have to collect my bag, make the transfer and check in again at GMP. According to my schedule I had 2hrs 40mins between arrival in ICN and departure in GMP. After reading the various posts on this transfer I was confident I would make it.

The AMS-ICN flight took off 2 hours later than scheduled and arrived 1hr40mins late. I didn't have enough time to make my connection. On stepping off the plane I asked the first person in a KE uniform what I needed to do. She told me to go to the transfer desk. At the transfer desk I was told that since the GMP-USN flight had been booked with KLM there was nothing they could do and I had to contact my travel agent. I called someone who was familar with this situation and he told me that this was rubbish and to go to GMP and sort it out there.

I used the buses at the front of the airport. The desks where you buy a ticket are outside the terminal next to the bus stops. I paid the english speaking desk clerk with VISA (no cash necessary) and was given a choice of 3 different buses, leaving from a row of stops just 10 metres from the desk I bought the ticket. My total transfer time from my flight touching down in ICN to standing in a check-in queue at GMP was just under 2 hours.

At GMP I went to the check-in desk and was booked on the next available flight to USN no problem. The girl at check-in even apologised for me missing the earlier flight!

From my experience I would say that if you're arriving at ICN followed by an internal flight with KE from GMP then don't sweat it about the transfer.