Section 252.4 - Smoking ban: air carriersAir carriers shall prohibit smoking on the following flights:
(a) Scheduled passenger flights.(b) Nonscheduled passenger flights, except for the following flights where a flight attendant is not a required crewmember on the aircraft as determined by the Administrator of the Federal Aviation Administration:(1) Single entity charters.(2) On-demand services of air taxi operators.(c) Nothing in this section shall be deemed to require air carriers to permit smoking aboard aircraft.Docket DOT-OST-2011-0044, 81 FR 11427 , Mar. 4, 2016 Docket DOT-OST-2011-0044, 81 FR 11427 , 3/4/2016