@Li**
I'm not sure what will happen at kk airport, normally I check in then check in again at either bkk or dmk but the last trip I had I cleared immigration at kk, like I said I wasn't aware it was possible at kk airport, after clearing immigration I was in departure gate all alone even although I was on the same flight with the rest of passengers going to dmk, once in dmk I was met by airport staff and was ushered to the departure hall for my flight so didn't see immigration at all in DMK. Anyway I got the re-entry stamp in immigration yesterday.