[hoipaloi]

Yeah Bangkok has two airports: Suvarnabhumi (BKK) and Don Muang (DMK). BKK is the airport you land at if you are going to Thailand from Europe or North America, etc. (but not necessarily Asia). DMK is the old international airport that mostly serves domestic flights and a small set of international flights to Singapore, Cambodia, Vietnam. Air Asia only has flights at DMK so when they list Bangkok they are correct.

[sirn]

Strictly speaking, BKK (Suvarnabhumi) is not even in Bangkok but another province, Samut Prakan. DMK (Don Mueng) is actually the one in Bangkok.

[peteretep]

The split is technically meant to be low-cost vs full service carriers, but it ends up being largely as you describe too