Thai have 737-8Z6 2 Aircraft This plane technically not owns is not RTAF but owns by
Majesty King Maha Vajiralongkorn

Registration:HS-HMK and HS-MVS

Callsign: is not always the same but mainly STF (Starfly) as a Starfly 904 for his to visit at that city
But if it Starfly 01 or Starfly 02 is mainly for Training flight

Are thailand have more aircraft like this?

Yes Thailand have the HS-HRH (737-448) and
HS-CMV (737-4Z6) as a secondary of his aircraft

So as a planespotter I know only this so I hope
y'all understand all of this

Thankyou

HS-HMK

HS-MVS