@SFOMuseum Instagram Posts This is SFO Museum's archive of the @SFOMuseum Instagram account. from April 19, 2016 There are 2 posts .

Before the advent of the Douglas DC-3 in the late 1930s, airlines struggled to cover operating costs from passenger services alone, and relied heavily on airmail and freight to make up the difference. This image was posted on April 19, 2016.

This image was posted on April 19, 2016. #traveltuesday