Thanks for all the info.
Yes, I'm arriving internationally later that day and we are meeting in BKK before the final flight together to CNX. I'l have to check whether the bags can be checked all the way as we are both flying different airlines into BKK before joining the Thai Air flight. My guess is we'll have to collect then recheck.
I guess if we both get the immigration done asap we can then meet airside. Are there more facilities landside or airside or does it not matter?