This is a million-dollar question that has not been cracked as yet.
Should you be eligible for Visa on Arrival in Thailand, but say you are connecting to a domestic flight immediately from Bangkok - per the normal procedure, you actually go through immigration (in the transit corner) in Bangkok before proceeding to catch your flight. But then, I don't recall a VOA facility at the transit immigration location. So if you are eligible for VOA, are your only options
1) Go through VOA procedure and proceed through immigration to ENTER Bangkok and go back upstairs to enter security, hence you have to buffer at least 3 hours ? or
2) Get visa BEFORE going to Thailand ?
I think this is the real question that anks329 is trying to ask at
http://www.flyertalk.com/forum/thail...n-bkk-hkt.html