Open search.aol.com See right side of Search Bar, See Text "Enhanced By Google" It means Both Search Engine(Google & AOL) Provide same Results for USA.
Aol uses Google search results. The phrase "Enhanced by Google" to the right of the search button on the results page probably means Aol is primarily piggy-backing Google search results, in this case
According to Business Insider, "...As part of the deal, AOL, which is now owned by Verizon, will make Bing its default search engine instead of Google for the next ten-years. The switch will take place January 2016." Google still totally dominates search traffic.