MILWAUKEE (AP) – The founder of the Experimental Aircraft Association, a group of aviation enthusiasts known for hosting one of the world’s largest air shows, has died in Wisconsin.  EAA announced the death of Paul Poberezny on behalf of his family. The organization says Poberezny died Thursday morning after a fight with cancer. He was 91.   A former military pilot, Poberezny gathered a group of recreational aviation enthusiasts in Milwaukee in 1953 to form a club for those who built and restored their own aircraft. The Experimental Aircraft Association moved to Oshkosh in central Wisconsin in 1983.   It provides education and training programs for recreational pilots and hosts AirVenture, one of the nation’s largest air shows and pilots’ conventions.