Hello,
I don't have any experience directly with taking a bearded dragon outside of the US.
It is correct though, that you will need to contact the airlines regarding what their rules &
regulations are. They do vary in their policies & I'm not sure which ones allow reptiles, etc.
There are a couple of dedicated airlines that just fly animals. I can try to dig up the websites
for you & post back for you.
Another thing is that you will need to contact the Ambassador or Embassy of the country you
are moving to & request paperwork for importing your reptile. They can answer other questions
for you such as quarantining, fees, etc to import. Since bearded dragons are not on the CITES
list meaning they are not an endangered species, you will have a very good chance of being
able to bring your reptile into Cambodia.
I highly recommend having all pertinent papers, documentation, permits, fees, etc taken care of
before you get to the airport so you wont have any problems or complications.
I hope this helps some.
Tracie