We booked our tour through Viator as I thought it would be cheaper. However, in comparison with other tour providers the prices were very similar, it only depended what kind of tour you would prefer and basically how much time you had. Initially I was a bit biased as I could not find many reviews on Viator but they were selling HeliUSA tours and turned out to be very professional and reliable. Our pilot Alexander was very informative and enthusiastic tour guide. Overall the experience was really amazing to admire all the stunning views from the air. It was about 1h flight via the Grand Canyon and Hoover Dam, Lake Lead. Grand Canyon as one of the Seven Natural Wonders Of The World proved its beauty entirely.