THAThai Airways has transferred a lot of its domestic and regional flying to THAI Smile, its lower cost subsidiary which operates 20 Airbus A320 aircraft. That makes award travel to many Thai cities problematic, because THAI Smile isn’t a Star Alliance member so miles from United, Aeroplan, LifeMiles and other Star programs don’t allow redemption on THAI Smile flights.
Thai Airways itself no longer operates any narrowbody aircraft.