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MAP-21

A federal law, the Moving Ahead for Progress in the 21st Century Act, enacted in 2012, that funded transportation programs and included provisions regarding air tours over national parks, specifically aiming to reduce aircraft noise.

Commercial air tour aircraft

Airplanes or helicopters used by companies to provide sightseeing flights for paying customers, particularly over scenic areas like national parks.

Quiet aircraft technology

Modifications or designs incorporated into aircraft to significantly reduce the amount of noise they produce, often involving changes to engines, propellers, or airframes, to minimize disruption to the environment and people below.

Grand Canyon National Park

A vast national park in Arizona, famous for its immense canyon carved by the Colorado River, which is a major tourist destination and protected natural area.