What is fit-to-fly?

[NAoZ]

I was checking for a place to do a PCR test for my upcoming flight out of Thailand. Many places had PCR and then fit-to-fly for additional cost. What and why do (did) we need fit-to-fly on top of a PCR test?

[Captain Monday]

"Fit to Fly". A separate signed attestation from a Doctor/medical personnel in addition to the covid test result lab report. Thailand required it for a while, long since abolished.

 

Never heard of other countries requiring it for entry. If you don't need it don't pay for it. 

[internationalism]

Big chance even this pcr requirement will be replaced by atk or completely dropped - that if you are vaxed. 
follow news just max 4 days before your flight, to save yourself hassle and costs. Pcr usually takes less than 24h, atk instant result (that one you can do at the airport - bangkok some 500b and 1h wait, level 1 door 7. Probably also at departure level (but i haven't explore it).