The Aircraft Owners and Pilots Association (AOPA) is a non-profit organization that advocates for general aviation. The organization was founded in 1939 and has over 300,000 members. AOPA provides a variety of services to its members, including pilot training, aircraft financing, and insurance. The organization also works to promote safety in aviation and to protect the rights of pilots. AOPA is headquartered in Frederick, Maryland and has regional offices throughout the United States.