San Diego Air & Space Museum Annex (Gillespie Field)

Housed on the active runway environment of Gillespie Field in El Cajon, the San Diego Air & Space Museum Annex serves as the working outpost of its parent institution in Balboa Park, a Smithsonian-affiliated museum established in 1961. Where the main museum emphasizes finished galleries, the annex is defined by hangar spaces, stored airframes, and ongoing restoration activity. For military aviation enthusiasts, its value lies in the way it exposes the logistics behind preservation: large aircraft that cannot easily fit into urban galleries, airframes awaiting conservation, and projects in intermediate stages of rebuilding. The annex extends the broader San Diego Air & Space Museum mission of interpreting the region’s deep ties to aerospace and defense industries, but here the emphasis shifts toward scale, structure, and material reality—riveted skins, aging composites, and the challenges of keeping historic aircraft serviceable as static exhibits. Set amid a general aviation airfield east of San Diego, the site underscores how military aerospace heritage depends not only on displays and narratives, but on hangar floor craftsmanship and long-term technical stewardship.