The non Thais were "proudly" phased out in the wake of the 1997 financial crisis.
I try to avoid the A300 between BKK and HKT, otherwise I am quite relaxed flying J class on the 777 and 744 on that particular run.
One should bear in mind that the alternatives to air travel within Thailand are really quite unpalatable.
But my preferred carrier to HKT is MI by a long stretch.