its partly a gimmick to draw attention from western travelers (which may backfire), but almost all Thai based airlines are big on hiring transgender flight attendants, partly due to their physical ability to reach 3-4 more inches from other cis women of the local area.. that may sound a bit sexist, but it does make a big difference when helping a customer put baggage in the overhead bin.
Thai Airways International has had for many years a very good percentage of their flight attendants that are trans, like double digit percentages.
on a side note, don't ya just LOVE how media still uses the term "Sex Change"? NOT!