Originally Posted by
dsquared37
Other posters have chimed in with your answer and I'll concur.
Just one clarification: You'll need to clear immigration in BKK however if your bags are checked through to HKT you'll clear customs there.
Yes, and to clarify further if this is your situation, there is a separate immigration area for connecting/transfer passengers to HKT, CNX, USM, and a couple of other places...so look for the signs once you get into the terminal airside and don't go for the main normal BKK immigration queues.