Formed in 1939 to protect the interests of general aviation pilots and private aircraft owners, the Aircraft Owners and Pilots Association (AOPA) grew to be the world's largest civil aviation organization during the twentieth century. The photograph collection largely comprises images of private planes, helicopters, and parts from various manufacturers who supplied the images for use in AOPA publications. AOPA activities, military aircraft, and experimental aircraft are also represented.

Atlantic Aviation was begun by Henry Belin du Pont (1898-1970) in 1927 to provide services for business aviation. In 1948 it moved from the Du Pont Airport to the new New Castle County Airport south of Wilmington, Delaware. Soon it expanded to other airports around the country. The collection includes portraits and views of Atlantic Aviation facilities at various airports. There are also a few photographs of airplanes, including the Spirit of St. Louis.

Cyril C. Thompson (1892-1976) had a long career in the accounting, management and public relations sides of the aviation industry, joining near the beginning of commercial aviation in 1928 and retiring just as the era of commercial jets began. Thompson was as an executive of United Air Lines for eighteen years, and later an airport planner, consultant, and prolific author and speaker. The papers of Cyril C. Thompson consist of a selection of items that he retained as mementos of the different stages of his career, plus materials and drafts for an unpublished biography of Idaho Senator William E. Borah and a never-completed personal history of United Air Lines on which he was working at the time of his death.

The DuPont Airport was a private flying field located on the west side of Wilmington, Delaware. The miscellaneous records include notices from the Federal Communications Commission and Civil Aeronautics Administration, tower materials, and airport arrival and clearance forms.

The DuPont Airport was a private flying field located on the west side of Wilmington, Delaware. The register gives time of arrival, make of aircraft, name of owner and pilot, origin and destination, and the number of passengers.

George J. Frebert (1929-2002) was a pilot and aviation enthusiast. He authored the book Delaware Aviation History. The collection contains both materials used in the preparation of Delaware Aviation History and other items that Frebert collected dealing with Delaware aviation, aviators and airports. Much of the material was copied from historical repositories, but Frebert also collected original materals and photos from other early aviators.

George J. Frebert (1929-2002) was a pilot and aviation enthusiast who served in the Air Force during the Korean War, operated the Dover Litho Printing Company in Dover, DE, published "Delaware Aviation History," and restored vintage airplanes as a hobby. This collection contains both materials used in the preparation of "Delaware Aviation History" and other items that Frebert collected dealing with Delaware aviation, aviators and airports.

The collection consists of photographs taken during the first years of the United States Post Office Department air mail service. Many of these photographs are portraits of individual air mail service pilots. The first use of air mail in the United States occurred in September, 1911, while the first air mail route from Washington to New York via Philadelphia started in 1918. A transcontinental route was established by 1920. In 1925 the government transitioned out of the air mail business with the passage of the Kelly Air Mail Act, which called for commericial airlines to bid on air mail routes established by the Post Office.