14 C.F.R. § 258.4 Unfair and deceptive practice.
Title 14 - Aeronautics and Space
The holding out or sale of scheduled passenger air transportation that involves change-of-gauge service is prohibited as an unfair or deceptive practice or an unfair method of competition within the meaning of 49 U.S.C. 41712 unless, in conjunction with such holding out or sale, carriers and ticket agents follow the requirements of this part.
Title 14: Aeronautics and Space
PART 258—DISCLOSURE OF CHANGE-OF-GAUGE SERVICES
§ 258.4 Unfair and deceptive practice.