CFR›Title 14›Chapter I›Part 121›Subpart DD ContainsSection 121.1500CorpusDaily eCFRDisplayed edition2026-04-15Last updated2026-04-15 Subpart DD—Special Federal Aviation Regulations Sections 121.1500 § 121.1500 SFAR No. 111—Lavatory Oxygen Systems. Previous X Subpart X—Emergency Medical Equipment and Training Next E Subpart E—Approval of Routes: Domestic and Flag Operations