Thanks nme7.

So, here's the bottom line. If I'm able to check in online and print a boarding pass from TK then I'll head for that transfer desk at ICN upon deplaning and those documents should suffice.

If I can't do the check in etc. via the TK website, then it's the heart-pounding rush through immigration, customs, and down to the TK check in area.

I'll make a call to TKs office at ICN before we leave Japan to confirm procedures and also to let them know that we will be somewhere in the airport trying our damndest to get to their check in booth if that becomes absolutely necessary.

Any others who want to weigh in here, feel free to do so.