Here's the answer from Bangkok Airways support:

The sealed flights have to be booked on a single ticket. That means your first carrier has to be able to book it for you. Since I'm booking directly with an airline, it's certainly impossible at this time

Probably possible via a travel agent

the announcement can be found here

which links to the flight schedule that does show the PG-5xxx flights

on my date for example it shows PG 5275, 5279. Other dates have others.

Still given that information, those options don't show up when I search to book a flight

@Geoff *****

I contacted Thai Airways since they generally match their rules to Thailand's rules. They would allow a recover certificate that was registered today if I were to have had been sick for 14 days already.

@Geoff *****

So your experience with thai immigration was that they expected the certificate of recovery to be 14 days old?

@Geoff *****

I think the wording was so unclear that even the consulates were confused. I know my friend specifically asked the consulate in Canada this question in early January and they specifically and clearly said that you have to have had the certificate for 14 days. So hopefully the more clear wording on the tat site and pr gov page will give us enough evidence to present to the person who actually makes the decision

@Geoff *****

I was pretty confused about their wording. It does sound like they are saying that you need to possess the recovery certificate for 14 days. But this quote from the official PR Thai Government page explains that the requirement is 14 days after infection, not 14 days after recovery

"2.5 If travelers' pre-arrival PCR test result is positive, they need a COVID recovery certificate in order to board the flight. If Day 1 PCR test is positive and they have a COVID recovery certificate, the doctor will assess your health, based on the fact that your COVID recovery certificate is only valid if you arrive in Thailand on a date that is no less than 14 days and no more than 3 months from the date of your positive test or when you were infected as shown in that certificate." posted Jan 25

I haven’t had any claims. But they are very responsive on WhatsApp They’ve changed the dates for free as well as changed the passport info. All right away. I’ve had a very good experience so far

If your Thai pass was approved between 00:00 in feb 1st and the time of checkin fir your flight. I believe it’s possible. But extremely unlikely

@Adrián *****************

boom!! That’s what I was looking for. You’re a legend. Thanks bud

@Adrián *****************

thank you for sharing your story. Did they hold you overnight?