The Aircraft Owners and Pilots Association, a not-for-profit organization dedicated to general aviation, was incorporated on May 15, 1939.
With a membership base of more than 340,000, or half of all pilots in the United States, AOPA is the largest, most influential aviation association in the world. AOPA has achieved its prominent position through effective advocacy, enlightened leadership, technical competence, and hard work. Providing member services that range from representation at the federal, state, and local levels to legal services, advice, and other assistance, AOPA has built a service organization that far exceeds any other in the aviation community.
Go to http://www.aopa.org/ for more information.