All American Engineering Company was an aeronautical engineering and research firm which was incorporated on October 31, 1952. The company was originally a division of All American Aviation, Inc. This small collection of photographs depicts air pick-up testing, airplanes, equipment, and personnel.

The engineering and research unit of All American Aviation, once the principal feeder airline for the mid-Atlantic region, became the All American Engineering Company in 1953. Their records document the early evolution of All American Aviation, the development of its system of air pick-up service, and its use in postal and military applications.

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selection of items that he retained as mementos of the different stages of his career, plus materials and drafts for an unpublished biography of Idaho Senator William E. Borah and a never-completed personal history of United Air Lines on which he was working at the time of his death.

Capital Airlines was a commercial airline for the eastern, southern, southeastern, and midwestern United States from 1936 to 1961. It was the fifth largest airline in the United States. The airline was the first to offer service from the west to Washington D.C., coach class service, in-flight television, and jet-powered commercial aircraft. This collection includes materials related to Capital Airlines predecessor company, Clifford Ball Airlines, and materials created under its former name, Pennsylvania Central Airlines. There is also materials related to the Capital Airline Association. The collection documents the history of the airlines, its aircraft and employees.

This collection includes materials related to Richard C. du Pont (1911-1943), pioneer in early aircraft and gliders and includes news clippings, official governmental documents related to his work as well as the logbook of his yacht, Nahma.

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.