@Cesar ******
I never said that you are lying. I said your comment is not true. Not true in its full extent - you don't necessarily need to have both flights on the same PNR. It can be on a separate PNR. It depends on which airlines you use. For example if I arrive at the BKK with Qatar Airways, and fly to Koh Samui 4 hours later with Bangkok Airways, I can fly on separate tickets but my baggage gets checked through and I can stay inside the transit, I then need to enter Thailand through a special Immigration counter on the way from the international to the domestic terminal . . . because these two airlines have a "codeshare agreement"