BKK Airways to Mae Hong Son?
 

Am reading reports on visits to MHS and flights of BKK Airways. Don't find them on the airline's website. ??????

As far as I know Bangkok Airlines does not fly this route. There is (or used to be) a direct flight from Bangkok by PBAir 3 times a week. Otherwise from Chiang Mai both Thai and Nok have flights

PB Air fly the route:
http://www.pbair.com/en/home/

Think you are confusing BKK Air with Nok Air. Thai recently turned MHS over to it's budget subsidiary Nok to service.

Interesting as Thai still shows 3 daily flights fot Dec booking and Nok 2. Guess Thai has not changed thrir schedule as yet.

Thai and Nok code share, so you can book flights through either site. If you book through Thai, I think you pay a little more, but you also get your Star Alliance miles.