Originally Posted by
Thai-Kiwi
Richard. USM-BKK is a domestic flight (Koh Samui to Bangkok, Bangkok Airways only as USM is a private airfield). There are no TG domestic flights departing at 0030, but plenty of international flights. So it wasn't too hard to work out the onwards flight (in TG C) was international... "Elementary, my dear Watson"
Not being from Thailand as you are, I didn't know this. Thank you for the education.