14 C.F.R. § 298.35 Limitations on carriage of mail.
Title 14 - Aeronautics and Space
An air taxi operator or commuter air carrier is not authorized to carry mail except pursuant to contract with the U.S. Postal Service entered into pursuant to section 5402 of the Postal Reorganization Act (39 U.S.C. 5402).
Title 14: Aeronautics and Space
PART 298—EXEMPTIONS FOR AIR TAXI AND COMMUTER AIR CARRIER OPERATIONS
Subpart D—Limitations and Conditions on Exemptions and Operations
§ 298.35 Limitations on carriage of mail.