{"data":{"id":"us/14-cfr-252.9","jurisdiction":"us","citation":"14 CFR 252.9","heading":"Ventilation systems.","body":"Air carriers shall prohibit smoking whenever the ventilation system is not fully functioning. Fully functioning for this purpose means operating so as to provide the level and quality of ventilation specified and designed by the manufacturer for the number of persons currently in the passenger compartment.","path":["Title 14—Aeronautics and Space","CHAPTER II—OFFICE OF THE SECRETARY, DEPARTMENT OF TRANSPORTATION (AVIATION PROCEEDINGS)","SUBCHAPTER A—ECONOMIC REGULATIONS","PART 252—SMOKING ABOARD AIRCRAFT"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-14.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:24:20Z","sha256":"2f621842c2e2dd84a6633c119d819d275f33bd73c7fc319fdaf8372de451e56b","source_id":"us-cfr","stale":true,"prev":"us/14-cfr-252.8","next":"us/14-cfr-252.11"},"notice":"GroundRules: Original legal text. Not legal advice."}