77ae0e81____Code_of_Federal_Regulations__ducting_an_operation_requiring
[If you hold] (1) A first-class medical certificate (i) Under age 40 12th month after the month of the date of examination shown on the medical certificate.
an airline transport pilot certificate for pilot-in-command privileges, or for second-in-command privileges in a flag or supplemental operation in part 121 requiring three or more pilots
eCFR — Code of Federal Regulations