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30 AIP Airport Improvement Program ANP Advanced Navigation Procedures ATC Air Traffic Control CDA Continuous Descent Arrival CFR Code of Federal Regulations CNEL Community Noise Equivalent Level dB Decibel dBA A-weighted decibel DNL DayâNight Average Sound Level FAR Federal Aviation Regulation GRE Ground runup enclosure ICAO International Civil Aviation Organi- zation Leq Continuous Equivalent Sound Level Lmax Maximum A-weighted Sound Level MSP MinneapolisâSt. Paul International Airport NADP Noise Abatement Departure Procedure NAS National Airspace System NEM Noise exposure map NEPA National Environmental Policy Act NEXTGEN Next Generation Air Transportation System Part 150 14 CFR Part 150, Airport Noise Com- patibility Planning PARTNER Partnership for Air Transportation Noise and Emissions Reduction RNAV Area Navigation SEL Sound Exposure Level Time above Time Above Threshold USC United States Code Vision 100 Public Law 108-176, âVision 100â Century of Aviation Reauthorization Actâ GLOSSARY OF TERMS, ABBREVIATIONS, AND ACRONYMS