Originally Posted by
Diplomatico
The government mask mandate ended on 23 June; however, private businesses can still require masks to be worn in order to patronize that business.
Bangkok's BTS still requires that one wears a mask to enter the BTS and - while I flew prior to the end of the government's mask mandate - it wouldn't surprise me if the airlines in Thailand are doing same.
And that is only for outside - the mask mandate is still in place indoors, as far as I know.