14 C.F.R. § 135.121 Alcoholic beverages.
Title 14 - Aeronautics and Space
(a) No person may drink any alcoholic beverage aboard an aircraft unless the certificate holder operating the aircraft has served that beverage. (b) No certificate holder may serve any alcoholic beverage to any person aboard its aircraft if that person appears to be intoxicated. (c) No certificate holder may allow any person to board any of its aircraft if that person appears to be intoxicated.
Title 14: Aeronautics and Space
PART 135—OPERATING REQUIREMENTS: COMMUTER AND ON DEMAND OPERATIONS AND RULES GOVERNING PERSONS ON BOARD SUCH AIRCRAFT
Subpart B—Flight Operations
§ 135.121 Alcoholic beverages.
