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agencies air tour industry air tour operators air transportation aircraft noise aircraft overflights Airlines airplane airport airspace airspace management ARAC areas ARNBARGER Association Bimstein Canyon National Park Canyonlands Chairman Hansen Clark County commercial air tours Committee complaints developed ENSIGN environmental FAA's Federal Aviation Administration Federal Aviation Regulation Final EIS flight free zones flight-free Fly Neighborly GCNP Grand Canyon Grand Canyon National land management LEDBETTER legislation LOWEY million National Park Service National Park System national park units National Parks Overflights Nevada noise impacts noise levels NPCA number of flights overflight issues Overflights Act park units park visitors passengers percent problem proposed protect quiet aircraft technology quiet technology recommendations regulations restore natural quiet river rule rulemaking safety scenic Scenic Airlines SFAR SkyWest SkyWest Airlines Springdale Subcommittee substantial restoration talking testimony Thank tional parks USATA Utah VALENTINE Vegas visitor experience Zion National Park