Problems with tour aircraft flying too close to ruins, an issue Montezuma Castle National Monument in northern Arizona reported earlier this year, are now being reported at Tonto National Monument east of Phoenix.
Park staff said Friday that tour helicopters and private fixed-wing aircraft have been "flying dangerously close to the Tonto National Monument cliff dwellings" and other National Park Service archaeological sites in Arizona for several years. Studies show flying close to archaeological sites, cliff dwellings, and historic structures can cause serious damage to these culturally significant sites, a release from Tonto said.
https://www.nationalparkstraveler.org/2020/10/pilots-urged-avoid-flying-close-ruins-tonto-national-monument