I would be very surprised if all incoming international flights are banned until August. The financial implications would be catastrophic..I think a ban until mid June would be more realistic. My friend who is a senior manager in the Thai oil industry has been told the airport could be open again by May
The entry requirements at the moment are to stop people travelling over the next few months. They want to present the image that they have everything under control. By November and the start of high season im sure there will be no entry requirements
If tourists are required to hunt around and try and obtain a pretty elusive health certificate and then spend the first 2 weeks of your holiday quarantined in your hotel room nobody is going to travel to Thailand and the authorities know this. These entry requirements are to stop people travelling here over the next few months. Come the high season and if the virus in under control I can imagine the requirements will be dropped
If this works I can imagine all the major airlines will follow suit. It's in their interests too if they want customers back on their planes. It's in nobody's interest to fly empty planes between Dubai and Bangkok because folk cant get the required certificates.
Emirates Airline is launching a facility in Dubai airport where they test you while you are in transit and provide the necessary certificates. I believe the testing done is by giving you a quick blood test with on the spot results