I made an appointment to obtain my covid 19 medical certificate RT PCR within 72 hours of departure at Urgent Care (California). The woman I spoke with has never heard of a "Fit-to-Fly-Medical-Certificate." Are you people sure that Thailand no longer requires this? When I call their consulate in Los Angeles and listen to a recording of requirements, this is one item on their list. Did they omit it from their official stipulation and forget to edit the recording? Where would someone in California go to obtain a "Fit-to-Fly-Medical-Certificate" if he or she so desired? If Thailand doesn't want it, maybe I should call my airlines (American Airlines / Japan Airlines) and if they don't want it either I could just flush the whole idea down the toilet.
TLDR : Answer Summary
The general consensus among travelers is that a Fit-to-Fly medical certificate is no longer required for entry into Thailand, especially after changes that took effect on May 1. Many travelers have successfully entered Thailand without this certificate, regardless of the airline. However, travelers are advised to confirm requirements directly with their airline as there may be some variations based on airline policies.