The San Diego based Ryan Corporation started in 1922 as an air service and quickly grew to become a training school, passenger airline, and aircraft manufacturer. In 1927 they built the famous "Spirit of St. Louis" for Charles Lindbergh in which he made the first solo crossing of the north Atlantic from New York to Paris. Teledyne Ryan Aeronautical remains in business today. The collection contains photographs, daybooks, letters, and many other items.