The Nation - News from July 29, 1987
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Restrictions on sightseeing flights over Arizona’s Grand Canyon and several other national parks because of noise and the risk of collisions passed the Senate unanimously, and differences with a bill passed by the House in May will be resolved in a conference committee. Twenty-five people died in a June 18, 1986, collision of a sightseeing plane and a helicopter over the Grand Canyon. Flights below the canyon rim would be banned, and aircraft would have to fly at least 2,000 feet over Yosemite National Park in California.