Originally Posted by flashware

Yeh, that's what I'm thinking. I'll do a little more digging, thanks for the help ^

Edit: the way I read MSC, as Aus & Sing are in zone 3 and BKK is Zone 3, with CDG Zone 2 (which the BKK-CDG is operated by TG F) then TG should be the MSC in this case as that's the first instance on the return journey of crossing the IATA areas.