Set amid the active environment of William P. Hobby Airport, the 1940 Air Terminal Museum occupies Houston’s original purpose-built passenger terminal, a streamlined moderne structure completed in 1940 with Public Works Administration funding. For military and aviation historians, its significance lies less in individual artifacts than in the building itself and the era it represents: the high point of propeller-driven airliners such as the Douglas DC-3 and Lockheed Constellation, when civil air transport, wartime mobilization, and postwar expansion were tightly intertwined. Designed by architect Joseph Finger, who also created Houston City Hall, the terminal illustrates how a growing air commerce hub organized flows of people, cargo, and aircraft on the eve of and immediately after World War II. Its near-demolition, subsequent decades-long neglect, and phased restoration by the Houston Aeronautical Heritage Society highlight the preservation challenges of early aviation infrastructure. Recognized by the American Institute of Aeronautics and Astronautics as a Historic Aerospace Site, the museum functions as a rare surviving piece of classic Art Deco airport architecture, offering a tangible framework for understanding mid-20th-century aviation’s operational and architectural evolution.