As for the medical certificate, it must show no prohibitive diseases as indicated in the Ministerial Regulation No.14 (B.E. 2535). The following must appear on certificate/report: (Name) is free of the following diseases: 1. LEPROSY, 2. TUBERCULOSIS (T.B.), 3. ELEPHANTIASIS, 4. DRUG ADDICTION, 5. THIRD STEP OF SYPHILIS, and that (name) is in good physical and mental health. You could also ask the doctor to issue such a medical certificate together with stating “Fit to Fly” in such certificate.