I have to give Bangkok Suvarnabhumi Airport (BKK) credit for a smooth and efficient arrivals experience despite the pandemic. I made it from my aircraft to the arrivals hall in less than 15 minutes.
Arrival Experience In Bangkok BKK Suvarnabhumi Airport 
After arriving in BKK on ANA, passengers were invited to disembark as if it was a normal flight. The arrivals hall was quiet, but looked no different than usual, at least initially.
However as I approached the main terminal hall, I as greeted by row after row of blue plastic chairs. There were hundreds of them stretching as far forward as the eye could see.
Everyone was taking a seat in the next available chair so I did the same.
Here I expected quite a long wait, but the line moved rapidly.
Masked workers in blue vests asked each passenger if they had their paperwork. They then glanced at it, not for detail but just to make sure the requisite components were there like proof of medical insurance and quarantine hotel booking.
Four minutes later, I was directed to a counter where a government agent (based upon the uniform) more closely checked my paperwork.
Recall, I had flown from Los Angeles to Washington to Cairo to London to Tokyo to Bangkok over the preceding five calendar days and taken my PCR test in Los Angeles. Would my PCR test, now almost five days old, be accepted?
The agent was a bit confused about the date, but when I explained I had begun my journey in Los Angeles, she accepted my test and allowed me to proceed.
For the next few minutes, I journeyed down the long corridor toward the immigration counters, just as I would normally do when arriving in Bangkok. Lines were not long.
The blue arrival forms are still necessary and are presented to the immigration agent who stamps them, tears off your departure card (you need not fill it out in advance), and stamps you into the Kingdom of Thailand.
From there, you proceed to baggage claim, gather any checked items, and exit. Outside, dozens of representatives will be waiting, each representing a different hotel.
Whether you are participating in Test And Go or Alternative Quarantine, after you find your hotel point of contact your name will be checked against a list. You are not allowed to leave that area without an escort.
I was surprised at how easy the arrival process was at Bangkok BKK. Arriving travelers were quickly and efficiently processed and I made it from the plane to the arrivals area in less than 15 minuets, which may be an all-time record for my many trips to Bangkok over the years.
I took these pictures on the way out – the airport is like a ghost town in the morning: