A tour group leaves Papillon Grand Canyon Helicopters’ new Hoover Dam helipad located adjacent to Hoover Dam Lodge hotel-casino in Boulder City, Thursday, Sept. 8, 2016. Jason Ogulnik/Las Vegas Re …

A tour group leaves Papillon Grand Canyon Helicopters’ new Hoover Dam helipad located adjacent to Hoover Dam Lodge hotel-casino in Boulder City, Thursday, Sept. 8, 2016. Jason Ogulnik/Las Vegas Review-Journal