Fly Act ) that different medical standards, or different, greater, or more frequent medical examinations, are needed to ensure an adequate level of safety in flight. (2) Duration of first-class medical certificate No person who has attained 60 years of age may serve as a pilot of an air carrier engaged in covered operations unless the person has a first-class medical certificate. Such a certificate shall expire on the last day of the 6-month period following the date of examination shown on the certificate. (g) Safety training Each air carrier engaged in covered operations shall continue to use pilot training and qualification programs approved by the Federal Aviation Administration. .