US lawFederal (United States)RegulationsTitle 40 CFR — Protection of EnvironmentChapter I — ENVIRONMENTAL PROTECTION AGENCYPart 87 — CONTROL OF AIR POLLUTION FROM AIRCRAFT AND AIRCRAFT ENGINES87.140 C.F.R. § 87.1Definitions.Last amended: 2022Year: 2026Length: 8 wordsOfficial source Cite as 40 C.F.R. § 87.1 (2026)Definitions apply as described in 40 CFR 1031.205.Cross-references to the CFR40:1031.205.Next40 C.F.R. § 87.2