@Mi***
You said "I've never seen a PCR test required for domestic travel." I'm not trying to be a jerk (though I know I'm probably coming off like one) just that the PCR test was a big deal for people trying to get into Phuket, since it cost more than the flight into Phuket.
As of now, I don't know. I think most places accept AKG tests. My buddy flys back and fourth between bkk and kk, no tests required for him, but he's vaccinated.