What are the current Covid-19 test requirements for Thai Nationals flying internally from Bangkok to Phuket?

Thai nationals flying internally from Bangkok to Phuket generally have the same Covid-19 requirements as foreign nationals. Vaccinated individuals need to present a vaccination certificate, while unvaccinated individuals are likely required to show either a valid PCR test or a certified ATK test. However, it's noted that in practice, checks on these requirements are not consistently enforced.