Originally Posted by dsquared37

Let's set the record straight here:

1) There is a transfer desk on the international arrival levels for domestic flights to select airports and CNX is one of these airports. So long as your bag is checked through to CNX you will not go through the regular immigration lane to streetside. Rather you will pick up your domestic BP on the 2nd (arrival) floor at the confluence of concourses A/B/C/D and go through Transfer Immigration there. You will pick up your bags and proceed through customs in CNX.

-All arriving passengers into BKK go through immigration whether it's ending up streetside through the main areas or transfer immigration when proceeding to a domestic flight. Customs can be dealt with at select airports which have these facilities and CNX is one of those.