Contents of the Collection From the Collection: The Northwest Airlines Collection consists primarily of company personnel, promotional, and flight service materials produced by Northwest Airlines from 1975 to 2007. The collection contains textual, audiovisual and visual materials. Formats include videocassettes, an audiocassette, slides, and photographs. In addition, there are an assortment of promotional materials, some of which are posters that picture company aircraft and early company logos. There are documents related to personnel...