14 CFR 150.9 : Aeronautics And Space (§ 1.1 To Parts 1311-1399) — (§ 110.1 To Part 199) — Federal Aviation Administration, Department Of Transportation (Continued) (§ 110.1 To Part 199) — Airports (§ 150.1 To § 169.5) — Airport Noise Compatibility Planning (§ 150.1 To Appendix B To Part 150) — General Provisions (§ 150.1 To § 150.13) — Designation of noise systems.